Dark Steelix #10 from Team Rocket Returns is a reverse holo holo_rare card that currently sells for about $41.45 ungraded, with graded copies ranging from $34.80 at grade 7 to $54.99 at grade 10. A grade 10 copy sells for around $54.99 vs $41.45 raw. That's a modest premium, so grading only pays off for near-perfect copies.