One of my biggest issues with going into towers is the fact that a few people take it as their responsibility to display EVERY item in game. This is fine, until you're forced to refresh the game after every tower.
Essentially a vending machine would function as a combination of an SDB and a cabinet. This way, you wouldn't get bombarded by a ton of stuff the moment you step foot into a tower and it would make it easier to group similar items in a small area, leaving room for decoration.