MA1 vs MA2 vs MA3 vs MA4
Some of the important factors:
1 - Overall population breakdown. We have the stats on member ratings. Do we just break the divisions into 4 breaks of equal population? What if that gives us 900+ for MA1, 885-899 for MA2, 870-854 for MA3, and <869 for MA4? Should we strive to keep the ratings range the same or the population size the same?
2 - Points spread within a division. Current divisions are 35 or 50 points wide. I've seen some suggestions on the internet that ask for wider ratings spread for each division. 900+ for MA1, 800-899 for MA2, 700-799 for MA3, <699 for MA4. If you think people complaining about sandbagging is bad now, wait until you hear the 801 rated guy complaining about losing to the 898 rated guy every week. Divisions exist to give everyone a reasonable chance to have fair and meaningful competition. Sticking two players in the same division who are 98 points apart isn't really meaningful competition. Lose by 10 strokes a round, 20 strokes per day? I know someone has to win and someone has to come in last, but we at least want to give everyone a chance.
3 - Local population vs worldwide population. With 100,000 members, we could create a dozen divisions with spreads of 10-15 points and the numbers would look great. But then when you get down to a local C-tier with 50 available spots, now you've just created a bunch of divisions with 3 people each. (This can also be mitigated by TDs not offering some divisions. At the World Championships, we offer MA40/50/55/60/65; at my local C-tier, I don't offer the 5-year increments, just MA40/50/60.)
4 - Worldwide population vs local clustering. I've seen some comments on social media where people say "MA3 is the problem! All of our tournaments are overrun with MA3 and MA1 players." Other people reply "All of my tournaments are overrun with MA2 players! I have to beg people to sign up for MA1." There's no universal solution. What we can do is give TDs the freedom and options to run events as best fits their local population.