Won't work.So, build your MEGA GO MONSTER, make a client to acces your beast and give it for free. Instead the clients will pay you 5 EURO montly to access your mega computer.
Those computers that run multi-user games, they are no more than glorified communication channels. The actual game runs locally. There is not a supercluster somewhere calculating the explosions on your screen and the AI of the characters etc. That is all done by your CPU.I think client/server and grid computing is future, so let's think a little bit in the future also ;)