When I went to the GPAA Gold & Treasure show this past year in Denver, I was there for about 1 1/2 hours (total time). I would think you might be hard pressed to stay much longer unless you came for the seminars (which I did not attend). Mostly I looked at (and bought) some of the dealer products. Even then, the choices were not all that exceptional in what was being shown (I tend to buy at local shops, online or build my own gear).
I was glad I went, but the show in Denver had a pretty limited variety of equipment for sale (and a lot of different vendors with pretty much the same stuff at the same prices). They also had a very limited amount of Metal Detectors - many of which were general purpose detectors (only a few that were good for Gold Detecting). It also gave me some good ideas if things I wanted to try to build.
I bought books/geological maps, some smaller gear and a Gold-N-Sand hand suction tool. If the show were in Las Vegas, I would have made a weekend trip out of it, but not for just this show.
NOTE: our GPAA club had 1/2 off ticket price coupons for the show - Check with your local GPAA (or the one in Las Vegas) and see if they have something similar.