I have a friend who is at the National AC with a roommate and so far the roommate bought a 1953 Topps set for $4500 and about $2000 in singles from various years.
My friend has spent $5500 on cards (mostly top rookies) and still has around $2500 left to spend.
These are just 2 folks walking the floor who admittedly are not afraid to spend some cash but can you imagine how much money is changing hands down there?!
Peace, Mike