But if I live in an apartment building, and my belongings can be burned to the ground because the apartment above me decided to put their microwave on the internet, I wouldn't want any of my neighbors doing this. It's not a good idea for everyone, everywhere, all the time.

* EDIT: Just the "internet enabled" parts mostly (unless you're qualified/experienced enough to understand the hazards), not all the other hardware hacks (i would estimate that anybody etching their own circuit boards would have a pretty firm understanding of electrical safety).