I have tried it myself for a while , and i agree with u on the low rates but its not a scam.
They have a very smart PPD table and the lack of statistics makes it look even More suspicious.If u get most of ur downloads from USA,UK,Germany like i do.
Then u need to move on. For 333 Download i get $2.5 average , yes its low but its also correct and not a scam. People need to look at the PPD table with all the big countries in lower groups and realize thats the real problem, just because people dont take the time to read and understand it all, doesnt mean its another scam.