I joined a commercial gym a few years ago, purely for Spinning.
Cost me about £50 a month, I think. I went twice, then three times a week and sometimes did double sessions.
I can't really use a turbo in my flat. My heavy breathing would make a lot of noise. I'd also need to find a way to contain the large puddle of sweat that I used to create. I could saturate my T shirt in about 10 minutes and for the remaining 30 it would constantly drip.
The showers were good too and the gym was always kept tidy (unlike my flat)
I sometimes got very tempted to try other activities too, but never did.
Purely for the spinning classes, I thought it was perfectly good VFM. About 10 classes a month worked out at about £5 a go. I got to use a spin bike, had a good instructor and could sweat myself ino oblivion and rasp as loudly as I liked while I thrashed my lungs out. I quite like very loud music, I certainly prefer up-beat musak to deathly silence and anyway, if you're trying hard enough, you don't really notice it.
I'm very seriously considering re-joining this year.
Of course, if you just join, do a few classes and put no effort into them, then stop going or just use the sauna, then you don't get VFM. Same as if you buy a carbon bike and leave it to rot in the garage.
It's not for everyone, but that doesn't make them poor VFM. It just means that you bought a product that you never really wanted. I think that some people join a gym and think that weight falls off by magic.
It's not for Wowbagger. But then again, doing something like Tia Chi while listening to Bach isn't quite for me. Allthough having seen Wowbagger do some Tia Chi, I reckon there's a lot of worth in Tia Chi.
Using a cycle for transport and fun is king for staying trim.