Want to set up your own grading/slabbing service?
http://www.mintgrading.com/pricing.html

Collectors send in their common cheap room keys/slot cards and you can assign your own arbitrary grade for a minimum of $3 each; $4 each if you want them back sooner, or $5 each if you want them back quickly.

The only one who makes any money on the deal is the slabber.