The artpass contest had one glaring problem: Everyone who entered and didn't win had a map that no one would ever play, no matter how good it was. And that was after ending up with twice as many winners as we had planned. Usually if you don't win a contest, hey, at least you made something and it might still be worthwhile or at least you could always improve it.
I personally treated it as much-needed detailing practice, but we got some damn fine entries that will never get played again. Hell, we got some damn fine assets that will never see the light of day anywhere else, too, although that's mainly the entrants' fault.