As a Topps era set builder, I have made hundreds if not a thousand purchases from GMC and have always been satisfied. More accurate and consistent graders than the TPG companies and a lot better customer service and shipping services. I have never observed any shady bidding practices just a large following of collectors who sometimes big high on a card they really want and then someone else comes along who wants it even more. Example: some followers seem to love the 1964 Mike Joyce card and over buy 3xs value; no one is shill bidding all of these but several folks seem to really want them.
GMC simply the bets option for set and subset builders. Thanks for making it easy on our dying breed.
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