earning money on youtube

I saw tons of people buying views to rank their mobile game hack and iphone jailbreak videos, how do they earn money from that? because no one will spend $200+ per video for $10-$20 earning. i know it's cpa but how does that work.

Please give me alternative for amf/l4l for getting youtube subs without subbing to any one, also if you could give me a bot too with it i am using youlikehits bot but the conversion of points to subs ratio is too low its as if there is no use for it, please help me out i am desperately looking...