The high grades that are achieved on older desired cards always bring a high premium since there was virtually no quality control . For our newer crypto cards a grade of 10 is almost a must on the common cards and on the rarer ginter x mini's a high premium would be expected especially on the mini black. There will be a few that grade at 10 but, I think they will go in the 3k to 4k range or higher. I currently think the red mini is in the 4k to 6k range and a grade 10 will probably move it into the 12k to 14k range and the silver will be held so I doubt we will see a price on it.
I read on the baseball card forums that the average new, pack-pulled card is about an 8.5 grade. The 9 grade is a small (arbitrary) bump from the average new card, but the 10 grade is better than the average new card, which is why it's so coveted.
Most serious baseball card collectors seem to feel like PSA9 is an excellent grade, and many collectors say that PSA7-8 grades are so close to the PSA10 grades (difficult to tell any differences with the naked eye) that all they collect are PSA7-9 grade cards. (And that saves them money to buy more cards!)
Personally, I'll chase the PSA10 grades, but I'm thrilled to own a PSA8-9 grade too.
Regards,
Chris
Well it's official, I just saw the email from PSA that I've been waiting for (took forever to PoP)....my Cryptocurrency Brooklyn Back just got a Big Fat 10 Grade!!! 
