Maybe somewhat similar to EasyAuction but simpler concept. No remembering previous prices, no reseting time limit, no GUI.
All I would like would be a small addon that auto fills the Buyout price based on the minimum bid price. If, for example, the name of the addon was AuctionHouseAutoFill, then the only slash command needed would be to set the markup amount:
/ahaf set 1.5 <-- would set the buyout markup as 1.5 * minimum bid price
If I drop an item into the auction slot that vendors for 9s, WoW fills in the minimum bid at 13s50c, then AHAF would fill in the buyout price at 20s25c (1.5 * 13s50c). If I change the minimum bid price to 12s, AHAF would update the buyout price to 18s. If I manually enter the buyout price, then AHAF leaves it alone and doesn't try to "correct" it ...