Zekrom ex #172 from Black Bolt is a rare card that currently sells for about $516 ungraded, with graded copies ranging from $466 at grade 7 to $384 at grade 10. TCGrader's AI has graded 9 copies of Zekrom ex (Black Bolt), averaging 8.8 overall. 78% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $384 vs $516 raw. That's a modest premium, so grading only pays off for near-perfect copies.