I call it 'dollar store value'; for something about the size of a VHS tape, chess piece (Dalek pieces!) or smaller (er, like 6" square sort of thing) its about break even or cheaper to print it out; if its at all large, its cheaper to just buy it at the dollar store or whatever. You want to make a little box to hold screws? Buy it at the dollar store. You want to make a custom designed thing for your pegboard, or a case for a model car, or whatever.. well, perfect.
Of course, if its a self designed thing, the printer is invaluable; you can design somethign, print it out, refine it, print it again. Its amazing.
--> I've made a tricopter (liek a quadcopter, but no extra rubbish motors :)
So if you are a creative type, who doesn't mind learning to CAD (open source stuff), its fantastic. If you don't have time to CAD, you're relying on existing models to print.. check out sitrs like Thingiverse to see whats out there.
If you want to mass produce stuff cheap, its currently the wrong game.
Good for makers, not so good for consumers.