They are starting to really come down in price, especially if you get in on one of the kickstarted projects. Buyer beware on the kickstarters, of course, and then there's the wait for possible delays.
I was able to come up with three or four possible things to make that could fix things around the house cheaply enough that it would offset most of the cost on an inexpensive one.
The more difficult thing to justify is the tinkering and maintenance that these inexpensive home units are likely going to need. I think I'm going to fall back on "would you rather I bought a flashy car and tinker with that?"