Mew #10 from Pokémon Rumble is a reverse holo common card that currently sells for about $55.00 ungraded, with graded copies ranging from $87.50 at grade 7 to $74.99 at grade 10. A grade 10 copy sells for around $74.99 vs $55.00 raw. That's a modest premium, so grading only pays off for near-perfect copies.