TC, I don't think you'll deny that there's often a double bump - an MS-63 gets upgraded to 64 because of its amazing eye appeal and toning, and then sells for 2x of the 64 price because it's so pretty. Technically, it's a 63, but it sold for a 65 price. That's the heart of a couple of threads that @ddddd posted where coins jumped multiples in grade (I think he showed an MS-64 Morgan that made it into a 66 holder? and maybe even more egregious jumps) based on the toning/color/ eye appeal. The coin was really a 65 or 66, but wound up in a 67 holder because that's where it's value was.