On a whim, I decided to purchase a 1993S PR69DCAM. I bought it because I have been thinking of starting some sort of graded proof Roosevelt collection. It seems that on Numismedia there is a distinct increase in value between a 69 and 70 rated coins. It's roughly a doubling in value for a clad and a tripling for a silver coin.
Where these price breaks are would they be considered a low ball coin collection, or is that term used in another connotation and definition?