Why?
Personally, I prefer to walk/hike but I understand that isn't enough for everyone.
That many/most people don't really utilize their gym memberships is a separate issue from some people getting value out of them. You seemed to be arguing that gym memberships in general are stupid for anyone.
It really depends on what kind of workouts you're talking about and what your constraints are outside the gym. Though I acknowledge many people are just on autopilot, get gym memberships they won't really use effectively, and waste their time and money.
(and don't say just do an alternative; there is none at those weights and I enjoy it)