Actually it sounds like a great idea, just have to worry about people trying to get in touch with the sellers before hand to get a jump on the rest of us because you know that's going to happen. Would kind of make a little extra work for some folks but a lot of dealers usually already have a list of what they have and check them off as they sell them. Some folks might not like the idea because how many times as you're looking for that Holy Grail item and you find something else you thought was cool. If you were to zip right to dealers A,B,C you might not find those hidden gems and the guys that have it might miss out on a sale since you didn't root thru his stuff. Another problem might be that it is very similar to giving someone an unfair advantage over someone else much like the no phone rule keeping someone from finding out about an item in another hall.
Jerry