If you understand the market for the items you collect extremely well, you can start doing this today. You just need to know instantly when you see something what it's value is. If you don't know any sets/issues/players, etc this well, then you either need to spend a lot of time studying, or just decide to not worry about it. I'm sure there are tons of people on the board who keep their eye out for things they collect and occasionally buy something they don't need just because they come across it and it's a good deal.
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