If you take a look at a regions high point series... you get an objective estimate. You will see that an active racer is probalby doing about 4 events plus a national type event.
If you set the number to qualify at 5 ... I find that you only get about 25% of the pool of racers out on the course that often.
4 is about one a month.. with a sailing season of May to Oct
Most don't really get started until late May and are done by Mid September.
(numbers are off of the top of my head and reflect Hobie Div 11 and the Open CRAC fleet in the mid atlantic.
Max drive is about 5 hours from Sandy Hook to West River with stops in between. (now that does include the largest populaton density in the country for traffic considertions).