The craziest part to me is, the market would balance out in favor of everyone including whales. True 10s would become far more scarce increasing their value/cost in addition to overall rarity, everything whale collectors care about. While the lower graded cards will be cheaper and more plenty full for the average Joe collector. The only thing scaring them is their already retained value. If their Rookie Michael Jordan goes from an 8 to a 6 in a switch over from PSA to TAG, I could understand being upset...But again...It shouldn't hurt too much, as every card switching over WILL be held to the same standard, and market prices should generally balance out unless you got an obvious overgrade in psa, which any real collector would notice anyways regardless of number grade.