Absolutely worth the effort.
As to deals. A few years ago we were not planning on a trip to Africa that year but one of the DSC auctions was for a 7 day plains game hunt with pre-paid trophy fees for a giraffe, bush pig, and klipspringer. I had hunted with that same outfitter {Not one of the "better known" outfitters.} the year before and they were at the show so I could discuss the auction hunt with them. I was the only bidder on the hunt and won it for $1850 if I remember correctly. We had a great time on the hunt and I added several other animals at the outfitters going trophy fees.
From others I talked to this was not an isolated occurence. I you do your homework before the show by reviewing the listing of auction items, doing on line research of the outfitters you might have an interest in, meeting with the outfitters at the show to see if you have good chemistry and get questions answered, and then bidding my experience would indicate there are a lot of highly discounted hunts that can be had. My caution would be to understand what is actually included in the package (Pickup/return to airport, trophy preparation, libations, etc.) and comparing their current flyer cost for the hunt, non-hunter if applicable, trophy fees, any non-inclusive items, etc before bidding.