I don't mean to shit on your idea, and I do find it interesting. :-) I'm curious how a household might benefit from having its own server farm. I guess decentralization could be one benefit. Can you think of others?
I could answer you with reasons. But in the 1980s, one would also ask - why should we enable a household to own a mainframe. But look at what we do with computers today. You could have a really smart kernel hacker/programmer running his own amazon like business. Not based out of the US and not susceptible to NSA snooping - (but his own country's intelligence agency could snoop - that's another matter altogether)