We sometimes drink in our games. The Sunday afternoon game, generally not (though we made an exception last time to celebrate the finish of Thunderspire and one player's new job), the Wednesday night game, generally yes, though it's usually only one other player and myself (the third drinker moved away

and we miss him). One guy never drinks, though I haven't pried as to his reasons why. I honestly don't see the big deal.
I'm all for banning players who behave like jackasses, but alcohol consumption doesn't factor into that equation in my experience—it's usually an underlying character defect that can be exacerbated by booze. I'd find any game that sought to regulate my behavior with regards to alcohol unacceptable, especially if it's a game with food; I don't get drunk, but as food is usually part of gaming for me, so is wine or beer. To be fair, I have a pretty strong passion for alcohol: I work at a fine-dining restaurant and will be taking the next step of the Court of Master Sommeliers Exams soon.
I'm with others who have found the whole idea of "dry games" completely fascinating. I'll continue to read this thread with interest.