What motivation do you need to join a site???

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I noticed that recently a lot of money making sites are being advertised in posts. Most of the time the person that start the post has only recently joined the site. I personaly believe that before one can advertise a site here, you need to be able to prove that the site has credibality. The person starting the post must at least have recieved payout once on that site. If a site is advertised here, and a lot of members join in and it turns scam, how much damage does it cause. The result is that members don't trust any site being mentioned on mylot anymore, and might mis out on some very good, honest sites, and loose bucks. If the person who mention the site have been payed, and can prove the credibilaty of the site, less members would be scammed and more will benefit by honest sites being discussed. Do you agree with my view, or am I wrong.