I read/heard somewhere (I think it might've been the Gabe interview on GTTV the other week) that Valve are totally against idling and are trying to figure out a way of stopping it.
tbh though, people will always find an "easy" way to get things like this and there isn't a great deal that the devs can do about it. Just be the bigger person and don't do it (if you dislike it), score 1 for moral victory, but loose one for not having hats

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