The thing is in Golf there is a real Pro tournament with qualifications and standings, etc.. In pool "pro" is as much a skill level designation as anything else. For an amateur, they are super impressed with a B player who can run out a rack a few times a week. For a Pro, you need to be multiple levels over that for them to consider you a rival. The club house "pro" is amazing compared to the doctor that plays a few times a month but both they and the actual "pro" golfers know where they are at in the overall pecking order.
The issue is where to put those mid range "pro" "shortstop" "open" players? They are too good for the lower levels to want to play with them even and have it be fair, but too weak to compete with the pro players. Probably the 700 range is the hardest to be in in order to find events to play in and have a chance to get to a payout, you are either banned from playing or not good enough to cash.