Adding this in the Auction house, Would be a nice addition for people that don't have the exact amount of money for that item they so desire etc. Similar to the ones already in place on OSRS or Rs3, In the end of the loaning period the item would be returned to the Market Place Auctioneer as a Claim Item. Owner of the item should be allowed to set the amount he wants to lend that item out for as well.. Obviously it wouldn't really make sense for lower cost items but, for the new slayer items, rares etc it would be very beneficial.