Have you ever contemplated your life while looking at your 8174 propane tanks? Well if you're somebody like that, not to worry, with the all new PR's Hefty Selling System! Sell your unwanted 5000 jerrycans that you don't even use, and get ripped off at the same time (preferably make it that you get 1/3 or a half of the original fee of the item)!
This wouldn't apply to ticket weapons and items.
(I do not mean to offend anyone mentioned in this post)
Maybe even implement a fee 'ratio' based on how many items a user has in their inventory.