Pfft. It isn't an appeal to authority to point out, among other arguments, that there are people who know more than we do, or that insider knowledge is specifically kept from the public. To illustrate...
Example 1: McPhee trades Forsberg for all the wrong stuff. If in the wake of that trade someone here posted that there must be some wisdom to it because McPhee knows things we don't, that would be an appeal to authority because there's no other information or argument supporting the trade.
Example 2: MacLellan lets Samsonov walk. Some folks' knee-jerk reactions were that it seemed crazy to just lose him for nothing. He must be worth SOMETHING! Our GM must not have even tried! What a mucking foron! Other people pointed to the many plausible reasons that there'd be no market for him and, yes, conceding that OF COURSE Mac tried to trade him because why wouldn't he? Anyone would. In this case there are many things you can point to and argue, with or without an appeal to authority, and the only argument that comes close to it is simple logic.
So I agree with g00n and CCF. Yes, on occasion you'll hear an argument defending management, but it's rarely ever just a claim that you should believe them because they know more and have access. There's almost always lots of other info and opinions that make the argument justifiable, whether you agree with it or not. (And I only say "almost always" because I don't remember it ever happening but have been hit in the head a lot in my life, so...)
On the internet, 90% of the time you hear things like "appeal to authority" and "straw man" it's just someone taking some buzzwords they got from a freshman Debate class for a spin. There's usually a little merit to the insight, but it's mostly just them saying "Your're doing it wrong!" instead of making an actual argument of their own.