Just from my personal experience, I bet you could list a lot of cards in not a lot of time. I have an eBay store. But I have a full time job, and this is just a hobby. It's not even my primary hobby side hustle. Yet I have over 2,500 listings.
If you owned a card shop, in just the time you were sitting around between customers I bet one person could list hundreds of cards a day. Granted, that's not going to make you rich, but if you keep doing that every day, it adds up.
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