On this thread people who would never get into Mensa seem to claim they could but didn't because it has annual subs:
https://www.theanswerbank.co.uk/ChatterBank/Question1822098-7.html
Mensa is a club the subs are not just for "bragging rights" you can be as involved as little or as much as you want. We have SIGs gatherings, Mensans are like masons we can look each other up in foreign countries, different towns. Often get free accommodation. There are social events every month all over the world, there are 50+ in my region alone in January. Many of you are in other clubs that pay subs you may have similar benefits or just are happy with what your club does. I get tired of people who could not get in if they tried, posting bile about what is basically just another club. PS the monthly magazine alone is worth the subs.