Well I went to the auction. Nothing "prop" related to my dismay. However they did have some autographed items by them, i.e large vinyl banners that each singed that I have not seen on the bay. They were going anywhere from $250-$500.
An interesting side note..the leather jacket Dean wears in the show..well used to anyway was stolen. During the Q&A someone asked why he doesn't wear it anymore and it was said that the jacket was sent off and "never maid it to the destinations"
About the photo-op yes you get a couple of seconds to talk to them. Its mainly..walk up look at the camera smile and your done. With as many people that were getting photos done it had to be that way. The guys tried to make my daughter laugh so my wife and her got a little extra time with them..
I would say there was only about 4 vendors. I believe there was a comic booth, supernatural merchandise booth, two separate auto graph booths and I believe a book booth.
I would say try and get the gold package and private meet and greet you could easily spend 2k on doing everything you would like to do.