Cool this thread I started was brought back.
The "gambling" ratings I'm used to go:
Pro
Open
A
B
C
D
I'm at the dcc and they have a 10 ball ghost challenge. You get 1 point for each ball you pocket, and if you run the whole rack, it gets scored just like a spare in bowling, with the next racks points being added to the current rack. they have 11 racks total, for a possible 210 total points.
Anyway, some top "regional" players that are consistent in cashing high and winning some open regional stops like the joss tour or mezz tour, have cashed several tines in us open and all dcc disciplines, were trying the challenge. They were scoring between 70 and 110 out of a possible 210. I was watching them play and they were not beating the ghost even in the traditional sense of win/loss of game.
These are super high quality players I'd put at open level.