I bought and sold TCG game cards (like MTG Yugioh Pokemon). Not just the inventory space, but the organization listing and condition checking all became a bigger problem the more the inventory goes. I wish I had just gone to a model of perhaps selling all to another business a few years back, and if I carry forward with this (after clearing out most of my inventory) at all then that is probably the model I would swap to in order to maximize my time, even at the expense of profits.