You are naive. Machinima (and other partner networks) are companies that need to make a profit, they are not charities. If advertisers don't see a return on their investment then CPM will fall. If it is found out that monetizable views are being bought and people are being paid (on a large scale), then they might as well close shop. This threatens their business model and they do care and they are checking.
Another thing, while Machinima may be paying you a fixed CPM they can see how much someone brought in of if ads were clicked. They just choose to pay you at a fixed rate, instead of a percentage.
In order to earn $30,000 a year doing that at $3 CPM you'll need to buy 12,000,000 views. People are going to notice and partner networks do care. You would be able to see that there is something wrong with the channel by just looking at it. It'll take 1 day to just physically look at all the 5000 channels. Google has programs to identify click fraud. What makes you think that these networks don't have their own to detect botted views?
found a video of Athene from Curse Network from a month ago talking about it
http://www.youtube.com/watch?v=PnVCk0LR3Cs
BUT hey, if this is a fool proof method and easy money with a 600% return on investment, then go ahead. Prove me wrong. It looks like you've stumbled upon a gold mine.
*edit* if I understand it correctly (from the video) youtube is flagging accounts (internally?) for suspicious activity?