Should you grade Slowpoke & Psyduck GX #239?

Borderline

+$693.26

net at PSA 10, but the gem rate is 36.7% — profitable only if it gems

The ledger

Raw card$178.07
Regular fee−$79.99
Shipping, both ways−$15.00
Selling fees−$148.05
PSA 10 sale$1114.37
Net at PSA 10+$693.26
Net if it grades PSA 9 instead$-66.62

36.7% of the 1,040 copies PSA has graded came back a 10. Pop gem rates are a ceiling — centering and surface on your copy decide.

Prices from real completed sales, updated daily. Population data from PSA's public population report.