My Wrenching News Auction final percentage has been running about 22% to 24%. That includes the catalog with pictures printing and mailing, the web catalog, hall rental, advertising, auctioneer (including clerk, cashier and ring men), around 2000 emails sent, and my commission. These are auctions with $50,00 to $90,00 plus gross, if the gross is smaller the expense percentages would be higher. This does not include transportation of the wrenches. I know this seems high but I haven't found a way to do it any cheaper.
I have also assisted collectors and auctioneers on site for a flat daily rate and expenses.