The average replacement cost of centralized nuclear and fossil-fuel powered power plants is about $1,500 per installed kilowatt. This might mean nothing to you, but consider this: a typical American household requires about 1 kilowatt to operate all of the electric implements in its house. Now consider this: how much money do you think it would cost you to somehow produce a home-based power producing system that is powerful and reliable enough to send 1 kilowatt worth of juice to your outlets upon demand? And this says nothing of securing the fuel and maintenance of such an instrument once you managed to create it.
My way of absorbing the reality of this is by considering how much time, effort and money I spent this year to grow a few pots of tomatoes, peppers and a small garden of sunflowers. I would post pictures of them but that would be embarrassing to all serious gardeners out there. I easily dedicated well over $500 of time and effort to this measly task, which required a minimal amount of materials and ingenuity (and the materials were largely traded for, not solely produced by myself).