Football point of view...
It can all be done on eBay (buy, then sell), but it's a lot of work. The key for me has been finding auctions that are poorly listed or end in the middle of the day. Sometime the profit is worth the effort, but if done in volume, you can do well. This is coming from a football card guy, so we're not talking thousand dollar cards. I would imagine pre-war baseball could be a better situation, but you're risking more on the buying end of the deal.
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