I find it stunning how stupid the Survivors always are at the auctions - they never spend all their money. There never are that many items, if you see something you want - bid for it! And if there's something that'll help you in the immunity challenge - bid everything you've got you idiot!
They don't show the whole thing due to time constraints. I remember reading a season or two ago though a list of all the other items the survivors won during the auction that didn't make the episode cut. Like last night, I don't think we saw Crystal bid on a thing, but I'm sure she would have bid on/won something at some point...