How do filehosts can give High rates for CPM ?

Hi all,
I am trying to understand the secret of this marketing related to filehost system.
So my question is : How do filehosts can give +$20 for CPM (1000 downloads) since AdNetwork even Adsense can’t give that rates for CPM ?
I just though because of selling Premium access, but even with that they should hope that will have 1 client from 1000 downloaders to get $10. So it should have more clients from 1000 downloaders to make a good profit, no ? Especially don’t forget the thing that downloaders are always the same on internet.
Do you have any idea for what really does this new marketing system work successfully ?
Thank you.

See original post by Net_Biz