I like using the sauna, I've just cancelled a Bannatynes gym membership as I was paying £30 per month for the gym and sauna (pool and jaccuzi were always packed out) but I could get the same gym facilities elsewhere for £15 a month.
All I can really see are gay saunas, or ones as part of a spa day. I'm not sure if saunas on their own are much of a thing? I'm in Greater Manchester