Good point, however, I would like to think the type of gamer who would care enough to put up an investment in a game would be a little more advanced than the "ur a fag" or "sony is teh suxxorz" variety.
I saw this news yesterday, and said to myself, "hell yeah, I'd give $100 to get a new Rainbow Six game that brought the tactical aspects back. I'd want the plotting of waypoints, and setting up a strategy, not knowing where the randomly spawned enemies would be located". Would this idea sell? Would I be overruled by 40,000 'nade spammers who just want to run n' gun? What about some "Colbert stunt" to get people to vote him in as one of the game's main characters?
I would envision a regular touchpoint, where the devs open up the game for feedback sessions. Certain aspects could be voted on by the financing community, but in the end, if 25,000 gamers got together and put up $100 each, they'd only be financing $2.5 million, hardly enough to have veto power or any sort of real input into the game.
In short, I feel like I'd be stuck with a run n' gun, 'nade spamming generic shooter, with Colbert as the villain, rather than the tactical strategy squad based shooter I so desperately wanted.
A good test of this may be in the DLC market. It's cheaper overall, already has an established fan base, and a quicker time to delivery.
Finally, my requisite slashdot conspiracy theory. Let's say you do invest in a game. The game is released, and people are playing it and buying it. It sells a million copies. People start griping because they've not seen any ROI (there would most likely have to be a profit sharing model in place). Publisher comes out and says, "yes, game X sold very well, but it wasn't enough to cover costs and credit obligations - because of PIRACY!!!". With that, perhaps a community led anti-piracy movement is created.