We get this question a lot at pick up! The honest answer is that we are busy getting the items that did sell out the door, so we don't sell items at pick up. Keep in mind that the starting bid for items is $1, so if it didn't sell, chances are it's not something in high demand or of any particular value. It is our policy to leave unsold items with the client for them to choose how to dispose of it (donate, toss, etc). Some clients may opt to have a free pile at pick up, and in that case, unsold items will likely end up there.
Items that are not picked up by the close of the pick up are likewise returned to the client.
Long story short: If you see something you want, bid on it!