I've done that with smaller priced cards from lots. Bought a lot either for resale or I needed a couple cards and the rest would be sold, then ended up keeping cards because they looked cool and would sell for $50 or less.
Probably the most expensive ones I did that with were matching 1890 N172 cards of Sid Farrar. I say probably, because I'd sell/trade them for the right price, so for now, I've just kept them a lot longer than I planned on doing. I got the first one so cheap for an OJ Player's League card that I held onto it and then when a second one popped up for an Ebay BIN bargain, I bought that one too and it looked cool to have two of them, especially considering how rare any 1890 OJ's are to begin with.
It's hard to see on the scan(easier in person), which is probably why I got them both for steals, but the PL symbol is off to the right of his left foot on both
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Please check out my books on baseball history. They include the bio of star second baseman Dots Miller. A book featuring 20 Moonlight Graham players who got into just one game. Another with 13 players who were with the Pittsburgh Pirates during the regular season, but never played a game. There's also one about 27 baseball families, as well as a day-by-day look at the worst team in Pittsburgh Pirates history. All five can be found here: https://www.amazon.com/stores/John-D...hor/B0DH87Q2DS
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