Here's a thought...
We all know that a Gem 10 stacks a decent premium on cards these days, some more so than others, but what if you have a card you consider "MINT", and it comes back an 8... does that then decrease the value, knowing full-well it's NOT "mint"....
For PC cards, I've had some Harris' graded, and didnt give two-tosses about the results, I wanted to 1.) wet my feet with grading, and 2.) encapsulate that card(s), to (hopefully) forever remain in that condition.
It can be expensive, but it could also be, as Coopz mentioned above, a better option to go via COMC.com.