Should you grade Golduck #31?

Borderline

+$29.72

net at PSA 10, but the gem rate is 31.2% — profitable only if it gems

The ledger

Raw card$5.00
Regular fee−$79.99
Shipping, both ways−$15.00
Selling fees−$20.27
PSA 10 sale$149.98
Net at PSA 10+$29.72
Net if it grades PSA 9 instead$-79.04

31.2% of the 16 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.