Have you seen how expensive a gym membership is?
"Nice" gyms like Equinox are of course significantly more. It's important to segment the gym market into different tiers and niches, and figure out what the market size is for each. Same as for direct equipment sales like this.
To your point, though, I suspect the people who would pony up for a Peloton are the same people who would splurge for a $100/month gym membership instead of a 24 hour, Planet Fitness, or local hole in the wall gym.
It's obviously not for people like me who would happily buy a set of used free weights for a few hundred bucks if I had a garage or basement.