BH, I don't market grade. I don't believe in it. Market grading is what you use if you're selling. The true grade of a coin is the technical grade. I understand that this is not a popular opinion, but market grading allows a coin's condition to actually improve over time and we all know that is not possible. The Sheldon scale was developed to take the guesswork out of grading. If market grading is still a consideration in technical grading then we may as well throw out the point scale and use terms like, "great condition for its age" and be done with it. I don't think any of us want that.
I'm sorry if this comes off as abrasive but market grading has been a sore spot with me for a very long time. Please don't take any of this personally. I have the utmost respect for you and the knowledge you share here.