Marshtomp

Grading with PSA pays if your copy has better than a 20% chance of a 10.

50% of the 2 copies PSA has graded got a 10. People mostly send their cleanest copies, so a typical raw copy's odds are lower.

Raw (NM)

$275.94

TCGplayer

PSA 10

$796.98

5 sales

PSA 9

$246.53

7 sales

If it misses

$246.53

below 10, by PSA's grades