Serperior ex #164 from Black Bolt is a holo illustration_rare card that currently sells for about $43.26 ungraded, with graded copies ranging from $25.00 at grade 7 to $68.55 at grade 10. A grade 10 copy sells for around $68.55 vs $43.26 raw. That's a modest premium, so grading only pays off for near-perfect copies.