Brock #15 from Gym Heroes is a 1st edition holo holo_rare card that currently sells for about $49.99 ungraded, with graded copies ranging from $49.26 at grade 7 to $3,400 at grade 10. A grade 10 copy sells for around $3,400, about 68× the $49.99 raw price, so high-grade copies are worth grading.