so I'm reading on SA about some 50+ boat Melges regatta.
I can't imagine how many bazillion dollars the boat, travel, crew, equipment, and entry fees cost for boats like that... yet they have a good turnout despite that.
So what keeps the (relatively) cheap beachcat regattas from being as well attended?
As many have said, Deep Pockets drives the M24 class.
It fits a monohull sweet spot; it's fast(for a keel boat), not too many crew (compared to a 45 footer) and Sexy (if you've never sailed a spin cat!).
I started out racing mono's and got up to the J24, before the M24 came out.
When it first showed up I took a look at one, I think back then (1994?) the base price was over $40K. I took my wife on board a new M24 at a dealer's. She took one look down below and said, "Are you KIDDING ME?? 40 Thousand dollars and there's not even a Pee Bucket down there??!"
I was getting tired of always having to make phone calls on Friday nights to be sure all of my J24 crew would show up Saturday mornings. I went back to dinghy racing, Lasers and JY 15 with my kids, where all I had to worry about was -me- showing up.
Now, if I had super deep pockets, and lots of -reliable- friends to crew it, I would have bought "One of Everything", ie. a big cruising boat, a medium sized racing monohull, an Open 60 trimaran, a Laser, an A cat, etc, but since I don't have deep pockets, I race what I can afford to race, with the only crew I can depend on. Right now that means an F16, Uni.
If I win the lottery, I doubt I'll buy a Melges...anything. Getting good crew to show up would still be a problem, but I will buy an A cat, a new F16, an F18, a Wave, a Hobie 16, a Gunboat 62, a couple windsurfers, and maybe that 135' trimaran that holds the around the world record. Oh, and I'll hire some strippers to crew it!