Should you grade Blastoise EX #17?

Borderline

+$174.37

net at PSA 10, but the gem rate is 16.2% — profitable only if it gems

The ledger

Raw card$12.48
Regular fee−$79.99
Shipping, both ways−$15.00
Selling fees−$43.51
PSA 10 sale$325.35
Net at PSA 10+$174.37
Net if it grades PSA 9 instead$-68.42

16.2% of the 487 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.