the auto sell function sucks, ending up with tonns of anicent runes and resurrection books (all under lvl) and no room for the actual loot when you finally get above the lvl set for auto sell. besides the healing pots which could actually maybe needed und auto use by heroes they do get sold by auto loot. honestly, don't get why ancient runes and resourection books don't get selled.
How much defense do you have?