The numbers you quote are the boats actually racing. The boats following the regatta are not really just people out on charter. They are almost 100% airline people who follow the published schedule. Many airlines will organize and book a half of dozen boats without any racing boats at all. They are simply there for the parties. SWA will have a dozen boats and I have never seen them race once. I am not actually sure I have even watched them sail. I once was speaking to the skipper of one boat who was a noted Naval Academy sailing instructor. I mentioned I never saw him sail only motor at the regatta. He replied in the last five regattas he has never put the sails up. Then he said, “Don’t tell my crew, they think we are sailing”! The planning for each years regatta starts almost as soon as the prior regatta ends.
G