It's probably a little of both. Some people probably are doing it successfully but like any financial market, most people that try will not have success. You see some strange business models. Every once in awhile I'll see a card that I thought someone overpaid for at a major auction get listed on the BST for a 40% premium above that.
Also, some people never handle selling themselves, so if they buy too much and then see something they have to have, they need to consign some of their stuff, regardless of when they bought it.
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