If there was a grading company out there that actually graded according to the rules I consider (IE; a bag mark on a Morgan Dollar will take you out of MS grades, cleaned is cleaned, even if it's a 1792 half disme) I'd probably use them all the time.
Sorry, the EAC grading service went out of business over 20 years ago. (Yes EAC did have its own grading service at one time.)