Voltorb #71 from Emerald is a reverse holo common card that currently sells for about $2.07 ungraded, with graded copies ranging from $11.00 at grade 7 to $0.98 at grade 10. A grade 10 copy sells for around $0.98 vs $2.07 raw. That's a modest premium, so grading only pays off for near-perfect copies.