Basically it's a local supplement brand that's been around for 10ish years, they've always had a section of their warehouse setup with some kit for the friends of the business but since moving units they've now got enough space for a proper setup.
It's a loss maker and the owner is entirely happy with that he just wants a place where people really serious about their training can go and use all ipf spec kit, infrared sauna, hyperbaric chamber, cryo chamber, get their bloods done, their shockwave therapy, sports massage, etc. He's got a section set up for martial arts because he's really into his BJJ.
Effectively it's passion project for him that he doesn't have to make any money on, membership is limited i.e. they need to know you're not a complete nipple as it's open to us 24/7 so they want people who will treat the kit with respect.
From my understanding the 50 people limit is like I said a paperwork thing, if he wanted to run as an official public gym rather than a club it then becomes much more of a pain and expense.
With regards to cliquey, yep that's exactly what you'd expect but in reality it's the total opposite we've got world record holding powerlifters, pro bodybuilders, worlds strongest men competitors and people like me who just like to train but everyone is there for the love of it and is happy to chat, share tips, give you a spot, call you a weak little bitch if you're about to fail a lift and need some encouragement
Got a bit gushy there

but honestly it's the best place I've ever trained in 20+ years and has really pushed me in the last 5 months it's been open.