I realize this topic has already been exhausted, but I am still somewhat amazed by Dean's Cards' business model.
I bought a '52 Bowman Minoso Rookie PSA 5 with cream color border in October for $275
https://www.mercari.com/us/item/m59903051311/ (Yes I bought in on Mercari of all places), but thought the card was over-graded and ended up buying a nicer one with the white border.
So I posted the $275 PSA 5 for $345 on ebay just to cover my costs and it was purchased by ebay user "stuckonthird" within hours, and when I went to mail it, the name was Dean Hanley of Dean's Card in Cincinnati Ohio.
I checked out his website, and the $275 card has been reborn as a $970 card.
I guess its like selling mattresses--the markup is so high that you only need to sell a few a week to make ends meet.
https://www.deanscards.com/Minnie-Minoso-Baseball-Cards
Anyway, he was considerate enough to leave me positive feedback....