You make the blanket statement that time-in-grade is about money. How do you account for associations that don't make money off the time? The NGAA, for instance, only gets any payment at two points: when you join ($40 when I joined), and when you are promoted (I think something close to $10 to cover administrative fees). They don't get a portion of monthly fees. So far as I know, that hasn't changed since I left. I don't think they're alone in that.
I agree that there's a lot of energy now around people being "too young" for a given rank or achievement. I think some styles flourished because their founder was around to keep tuning, building a student base, and developing instructors to follow them. If they founded a style at 60, there's not much time to accomplish all that.