I have been a member of inbox dollars for years and they are no scam. You do not get rich but if you earn the number of dollars necessary to request a check then they will send that check upon your request. They are very good and I like them another good site is send earnings.
A site that is a scam would be: "Opinion Outpost", they start off paying you the little 10.00 or 20.00 dollars just fine and then you cannot get into your account, they have kept you little money and you never get paid for your time. They do not seem to realize that time is money and unless you volunteered your time then you should get paid for it. "Opinion Outpost" wouldn't let me make over 35.00 in a month, their surveys are super long and sometime after you have spent close to an hour on a survey they will say you did not qualify.
On inbox dollars I have earned a 100.00 dollar check before, they do not cap your earnings