to be honest, I don't know why they wouldn't have moved this to the philly convention center. I mean, they just re did the entire thing (and it's huge). I figured this to be the spot before they announced the hotel. Not to mention, Philly is a rather large beer drinking/homebrewing area (hell, there's 12 some odd clubs in the area). Again, I would have thought based on last year's turnout, the fact they haven't made it to the east coast in a while, and the area picked, they'd be ready for a much larger turnout.
about the only thing I can think of: the union you'd have to go through in the convention center (though I would assume you'd have to go through the same union in the hotel, since it's still in the city).