Story

Say I had to guess who is making the cash.. I think it's probably the site owner serving the ads that they hire botnets to view, more than enough money to go around.

It's probably a pretty safe investment too.. yeah, you're hiring botnet dudes, but there's probably no paper trail between the two groups, and as they're not using the botnet to DDOS, or steal CC info, I'd imagine they're pretty low down on the LEO most wanted lists..