I was just emailed asked if my traffic was PTC and the answer is NO, it redirected from expired domains......please read:
**PTC advertising (Paid to Click, or paid to surf). This is often advertised as the "best" traffic solution since there will be real people surfing your website and viewing your content. These guys and girls are paid to visit your website and stay there for a minimum of 30 seconds. The pay off depend of the network dealing with this type of traffic accumulation but the average payout is 0.01 USD. So we do a little math, with 0.01 USD per 30 seconds, we are paid 1,2 USD in an hour.
Assuming we won't be able to do the surfing non-stop and we have pauses checking the emails, loading the website, and so on — we come down to an average rate of 1$ per hour. That's like 7-10 times LESS than a regular low paying job of any type, even serving cheeseburgers in MacDonnald's will bring you 8 times more green.
So we obviously deal with people who are more likely to be poor, than rich. Or they are more likely to be from less-developed countries, where $1 per hour would be a high payout. Either way, now think: would this type of traffic actually BUY your product? They are paid $1 per hour, they need to sit by the computer the entire working day just to make $7-$8, will they really spend $50, buying your anti-virus program, ordering your T-Shirts or subscribing to your premium, over-priced email marketing solution? Of course they never will.
The only thing PTC traffic can do is click on Adsense ads, and yet again in only one condition, if the ads happen to be related to "Make money online" opportunities, but here comes a surprise, PTC traffic is against Adsense Policies and whoever tells you otherwise, simply leads you astray or didn't do his homework.