I completely agree with you there. However, there is limited ways to be able to get to know about a site like this as soon as it starts up, unless you are very lucky to see the original advert. Often most of the time that people see this is through PTC ads with other people's referral links, and this in my opinion, is already a sign that it has been around for a little while and has made some payment, so it is a greater risk when you see it on a referral link.Diversifying your investment in several sites is great. But I think even when doing that, you should check on how long the sites have been in existence. Most of those which have existed for long will prpbably not pay. Although it is not a gurantee that they will pay, it is best to invest in pretty new sites. Or you can just steer clear from these method of earning and focus on less risky ones.