We've got a group here that play Warmachine that like to run tournaments from time to time, and they find it perfectly all right to proxy models with a bare empty base. I find this practice to be beyond ridiculous. I pointed out that you should at least have a model and not just a bare base. The argument that came back was "well, some people can't afford to buy every model they need for a game". To which I said, "then clearly you're in the wrong hobby."
It went rapidly downhill from there. These guys claimed to be wargamers until I said "if you're not playing with a model and just using the base, you're not wargaming, you're playing checkers!"
We had a gaming convention here last year, and I must admit I was disappointed to see the number of unpainted 40K armies that were used. The guys that had put in the effort to paint their armies, had some phenomenal looking armies, but it still didn't balance out the slackers. I've never been keen to use troops or models unless they were painted, but it seems that simple standard isn't as important to some.