I'm thinking that like everything else in life, it comes down to one or two things;
1. Time
2. Money
3. Both
Well, hell. You could have saved me three hours of work.
Jake, I encourage you (and anyone else willing to take a hard look at their data) to prepare graphs and crunch conclusions. I think this can shed some valuable light that can help across classes and areas.
If the conclusions truly lead to the simple reality of time and money, I stand by my prior recommendation. Have fewer regattas per year to pull our time/cash resources; but instead of throwing events away forever, rotate them over two years rather than one.
Mike