While anyone can join paid to click sites, they are definitely not for everyone.  Here are some common mistakes I have seen people make (including myself). - under construction

Common mistakes at paid to click sites in general  -

1. Inactivity - people who join and do nothing or they are active at first, but for whatever reason they stop clicking.  I see this happen all the time at paid to click sites.  People join as if they were interested in the site, but for whatever reason they do nothing.  They don't view ads, do surveys, watch videos, nada.  Or they join and are active at first, but for whatever reason, they cease to be active.  You know, like any kind of job or gig (online and offline) making money with paid to click sites takes time and effort on your part.  I get comments from people about making money with affiliate programs and how they can be easier, but as a veteran affliliate marketer myself, I know that even affiliate marketing can take time, effort and even sometimes money (such as advertising and marketing the links you are given to promote). In paid to click sites, if you are not even clicking ads, how do you expect to earn?  Sadly some people join and do nothing (perhaps expecting their referrers to do the work for them).  Of course, they can't expect their uplines to do their rounds for them (even if they wanted to, it is against the rules to have more than one account at most sites).  For best results at ptc sites, you do have to be active and viewing ads almost every day.

2. Joining too many sites -  I am guilty of this myself.  There are so many different paid to click sites on the net and it can be hard to chose which ones you want to join and take advantage of.  When doing your rounds you often get bombarded with ads from other paid to click sites, paid to sign up offers that entices people to join extra sites, or maybe you decide to trade sign up links with people (you join a site in exchange for people joining your site).  While it can be tempting to join multiple paid to click sites, I recommend setting a reasonable limit on how many sites you join (at least at first).  I think a good reasonable number to start with is between 2 and 5 sites (unless if you have lots of free time on your hands and don't mind spending hours doing your rounds at all of the sites you are a part of).  Joining too many sites can make things overwhelming and you can easily find yourself spending hours trying to go through all of the sites you use.  I am a member at 15 different sites myself and even I struggle to stay active at all of them.  My advice is to not join more sites than you can handle.

3. Joining scam ptc sites.  You know as with most work from home opportunities from the net, while there are many legitimate paid to click sites out there (like Clixsense for example), there are also scam paid to click sites you will want to stay away from.  Sometimes you might know if a site is a potiential scam site until down the road.  Here are some rules of thumb when choosing sites to join:

- use caution when joining new paid to click sites.  This is not to say every new site is a potential scam site, but sometimes they do turn scam.  Two examples I can think of recently are Talebux and Valuedbux.  They both seemed legitimate and are similar to Get Bux Today, and Valuedbux even offered free premium upgrades to the first 2000 members to join.  Sure enough, both sites ended up going out of business and are no more.  Always use caution when investing in these kinds of sites since you will lose your money should they go out of business.

- Sites getting bought by a different host.  A classic example of this was Bux Levels.  It was a paid to click site that offered a 4x3 forced matrix system and while it was stable at first, eventually it got bought out by another company and while it was online for a while, it eventually went out of business, never to be seen again.  

- Check forum sites like Talkptc and Earn Money Space (in fact Talkptc has a comprehensive list of known scam ptc sites).  Also, when you are on those forums, there are threads where people can post complaints about various ptc sites and suspicious activity on the different sites on the net.  If you see too many complaints about a particular site, that should probably serve as a warning of a site to stay away from or at least be cautious of.  It is not to say those sites are officially scam sites, but lots of complaints could mean a site is becoming unstable and is at risk of turning scam.

- Outrageous claims.  Richptc is an example of this, offering $1/click and $1000 min cashouts.  Of course most legitimate ptc sites have much lower earnings per click rate (the norm is anywhere between $.0005 and $.02 per click).  By the way, if I were an advertiser, why would I pay visitors $1 to visit my site for a few seconds when I can pay less and get more clicks for each dollar I spend.  If I wanted to pay $1 or more per click, I could go to sources that offer more quality traffic like Facebook or Google Adwords.  

- Censorship in forums (either that or no forum at all).  Lots of complaints or censorship could be a sign of instability.

- Changing rules.  For example having to go through the hoops when requesting payment.  For example, you shouldn't have to upgrade to cash out.  

- Sites not paying.  When working a particular website, when requesting payment, you should get paid sithin a few days from the payment requests .  If they don't pay or take too long to pay out, that can be a sign of a scam site.  One good way to test this is to request payout as soon as you hit the minimum payment threshold (at least the first time).

- Signs of abandonment.  If it looks like a site is losing people and customers, that could be something to watch for.  Matrix Mails is an example of this as most people seemed to have left matrix mails.  Also at Get Bux Today, I have noticed that there are usually only 2 ads one can click: a bot trap link and a legitimate ad (obviously most people will want to avoid the bot trap link).

This list can go on, but go by your instinct and if you suspect a site to be too good to be true then it probably is.  By the way, forums like earn money space and talkptc are good sites to check for potiential scam sites and keep up to date on the news in the ptc industry.  

4. Upgrading too early upgrading too often.  While it is usually free to join paid to click sites, most do offer paid memberships for extra features and benefits.  Of course, I recommend weighing the benefits and cost before upgrading.  It is also worth noting that you can usually "earn" your upgrades by earning money from viewing ads and referral clicks (along with taking advantage of other ways to earn such as offer walls, video ads, etc) and then upgrading when you can afford it.  Some sites do cost more to upgrade at than others and sometimes it it can be better to wait on upgrades.  For example, at Neobux and Probux, upgrades sell for about $80/year and $90/year respectively and it can be understandable if someone is hesitant about spending that much.  Some sites even offer upgrades for almost $1000 (such as getting an ultimate membership at Probux, selling for about $700 per year or getting the VIP membrship at Ojooo which sells for about $999 per year).  Obviously most people are not going want to spend $700 or more for upgrades unless if they can afford it and are comfortable with the sites.  My advise: don't invest more than you can afford and if you must upgrade I recommend upgrading at 1 or 2 at first.  Though there are some sites where upgrading can be beneficial, such as Clixsense (you get significantly more ads to click and enroll in the downline system they have) and Scarlet Clicks (upgrades sell for only $5/month).  My advice: don't feel like you have to upgrade at every site you use.  Be picky about where you upgrade.

5. Renting more referrals than you can maintain

6. Not reading the terms when doing paid to sign up offers

7. Clicking bot trap links

8. Not taking advantage of extra features sites offers.

9. Giving up too soon

10. Not having virus and malware protection.

11. Responding to ads you are not really interested in.