I suppose you could argue that Bonham's has a pretty wide client base, or whatever you call it, plus some snazzy talking auctioneer to try and sell the item. Oh yea a catalogue is issued with your piece on it. What else erm..........clean toilets??
I s'ppose all that can justify 20%.
What gets me is that we, the Joe Blogg's of this world have the power to knock seven shades of shyte out of any mega corporation. I remember about 7 years ago, I think it was Shell (or Esso?) was getting a bit cocky with their petrol prices, so someone put out an e-mail urging everyone to forego 1 visit to either of these reteilers per week. The prices came down soon after, not by much but still by a token amount.
Why doesnt't every body just boycott Ebay for a month? Then we'll see them get the heebie-jeebie's.