1) I'm ALL for this move. Granted, I've never been to Otakon, but this sounds like a fabulous idea. The AUSA rave was held at the hotel ballroom, and there was a significant amount of room. Everyone had their own little space to dance and it wasn't overly crowded.
2) I think it would bring in more people because of the amount of extra room it would give people. From what I heard about last years rave, it was fairly crowded (for a rave) and moving it to a bigger space would allow for better airflow and circulation and less con-funk.
3) This would be so awesome, because I'm staying at the Hi