Interesting post, I’ve been thinking about exactly this. I’ve been chasing down ‘16 BC Soto Autos and have noticed the PSA 10s are selling for more than BGS 9.5/10s, even with autos IMO are 9s. The common flaw in the auto of the ones graded 9 is the line he draws under his first name. The first two photos show some PSA 10s that would surely grade a 9 auto; but sold for well over what a 9.5/10 (or even a 10/9) would:
Here’s a 9 auto for reference:
The 10/9 sold for $508. A crossover to a PSA 10 would get $660 to prove your point.