I play in the Amsterdam League. Outside of IPT member Steve Lipsky who is one of the top Straight Pool players in the country and has regular centuries, I have the highest ranking and I've not broken 50, although I have had six 40+ runs (I'm in my third season). Apart from Steve, the only player in the League I know to have broken 50 is Jude Rosenstock who I think has a high of about 66. However, Jude is the only "A" player in the League. Another guy Tom is the same standard as me.
The format is everyone has a rating, and then there is look-up chart to determine what the race is. Unless players are very weak (APA3 standard), the higher ranked player always goes to 100 (Steve goes to 200). There are two Leagues, Beginner/Intermediate and an Intermediate/Advanced. The cut-off is at the rating of 150 which roughly equates to an APA5. There are only about eight people over 200, and three over 250 (me, Jude and Tom). The chart works by scaling down your ranking to get the race to 100 (and rounding to nearest 5)
i.e.
rating of 300 plays someone rated 225, race would be 100/75.
rating of 250 plays someone rated 220, race would be 100/90
Steve Lipsky plays at 800.
The League itself is great play to in. Obviously, the hall itself is well renowned, but the League is well-organised and at the end of my match, I also get to challenge SJM!