When the stack gets too big, you buy some shelving. When the shelving gets full, you buy some storage tubs. When you run out of tub room, you get a storage unit. When the storage unit is full, you realize maybe it's time to sell off the backlog. Then when you're almost done, your spouse gets into Gundam. And this time you start a spreadsheet to keep track of the cycle. Then P-Bandai opens in your region.