Mewtwo

Grading with PSA pays if your copy has better than a 4% chance of a 10.

9% of the 11,407 copies PSA has graded got a 10. People mostly send their cleanest copies, so a typical raw copy's odds are lower.

Raw (NM)

$39.33

TCGplayer

PSA 10

$800.00

11 sales

PSA 9

$172.25

19 sales

If it misses

$90.32

below 10, by PSA's grades