The Hoarder is constantly looking for items to add to his collection. You can use the quick stock feature in your inventory to quickly sell items to the Hoarder. The way the hoarder works is that he takes your unwanted items and pays you 30% per item according to the items current market value. The hoarder will sometimes have extra of an item and decide to see it to the public for a 30% discount off the current market price. Keep checking for new items that are added to the Hoarder as people sell their items.