Mewtwo

Grading with PSA pays if your copy has better than a 2% chance of a 10.

14% of the 1,192 copies PSA has graded got a 10. People mostly send their cleanest copies, so a typical raw copy's odds are lower.

Raw (NM)

$17.86

TCGplayer

PSA 10

$1,913

24 sales

PSA 9

$90.16

33 sales

If it misses

$64.80

below 10, by PSA's grades