Pay per download envirofile.org site maybe is not a scam, but I you want to earn much money, stay away from them. They pay $0,25 per download to $0,45 depending of total months download. Most of people are earning about $100 months. Envirofile pays them $0,25 per download and everyone is happy. Problem appears when someone whants to earn more, for example 6000 downloads x $0,35 per download = $2100. Envirofile gets less money per every download. It better to have lots of user per $100 than few users per $2000. Tier 4,5,6,7 for $0,31 to $0,45 per download is fiction. Here is my story. First month I was testing envirofile and earned only about $100. My earings was approved, so I requested a payment and drived more traffic in next month earning above $2500 using the same method as first month. They didn't pay me anything... Even my approved earings from first month! It's not fair. I made too many (?) downloads and they treated me as scamer. But very important fact is that there was natural downloads in accordance with they rules. When they catch scamer it's OK, that's they rules. But what they are doing it's not OK. I'm not sad that they steal my money, I will earn more elsewhere.