Vaporeon ex #23 from Prismatic Evolutions is a holo rare card that currently sells for about $4.12 ungraded, with graded copies ranging from $14.23 at grade 7 to $78.00 at grade 10. A grade 10 copy sells for around $78.00, about 19× the $4.12 raw price, so high-grade copies are worth grading.