3 laps because of a few reasons id imagine...
huge turnout like you say, 230 is alot of cars..
does the course cross over on itself? our local spot doesn't so there can be 3-4 cars on course at the same time.
and the main reason some places get more runs than others is due to how efficiently they run registration, tech and score the runs.
tons of reruns always screws it up for everyone, timing problems always hurts too and if people are way disorganized with poorly visible numbers, screwing around in grid, shagging cones slowly, etc, it can all backup.
we may have a short season, but most clubs here do their best to make the most of it.
you should check some of the private clubs around you.
for instance.. here are some clubs that I run with in my current car, regardless what club they are...
-Porsche club (just need a vin # and become a member to run with em)
-BMW club (just need to be a member to run with em)
-Miata club (just need to have a mazda or be friends with a miata guy to become an "associate" member)
-Corvette/taurus sho Club (just need to sign up for the events) (dont ask how sho and vette came togeher, but they did)
you are just touching the tip of the iceburg, keep lookin, im sure you can find some more and better places to run