One of the funniest things they do in the show is bring a (so-called) expert in to appraise the item, right in front of the seller!! So the expert says 10,000.00 value on the item, then the seller says he will take 10,000.00.
Why don't they get the item appraised without the seller there, so they have a better idea what to buy it for wholesale? I guess, so it doesn't make them look shady, and trying to take advantage of the seller.