Although it's a hockey card I picked up a Gretzky PSA 6 Topps rookie for $200 for my PC around 2018. I popped it out and threw it in my safe and didn't think much of it. When the market went crazy around 2021 I looked and 6's were going for $2k so I figured "Why not send it back to PSA and get $1800?" I sent it back in and came back the same 6 and sold it a week later. Crazy that such a common card would go up 1000% in a couple years.
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