I always thought that auction houses were making a tidy packet, if you watch TV programmes like 'Flog It' or 'Dickensons Real Deal' they always warn you about the fees, some charge 20% plus VAT, that is saying that on an item that is sold for £1000, both the sellers and buyers pay £200 each in fees plus VAT, thats £400 to the auction house for a few minutes work.
I know they have to store the item, advertise the item and publish a printed programme, plus insurance, but it does seem a lot of money.
Good job if you can get it!