Slowking #14 from Unseen Forces is a holo holo_rare card that currently sells for about $30.00 ungraded, with graded copies ranging from $28.74 at grade 7 to $41.00 at grade 10. A grade 10 copy sells for around $41.00 vs $30.00 raw. That's a modest premium, so grading only pays off for near-perfect copies.