Brock's Rhyhorn #22 from Gym Heroes is a holo rare card that currently sells for about $5.93 ungraded, with graded copies ranging from $10.51 at grade 7 to $45.86 at grade 10. A grade 10 copy sells for around $45.86, about 7.7× the $5.93 raw price, so high-grade copies are worth grading.