Are you saying that the average person who earns enough to afford a gym membership makes more money than the average hardcore bodybuilder?
Pretty much, and there are tens of millions of "average" people who make decent money. Also, the higher income crowd tends to care about fitness, and they will pay for it.
When I was working out in downtown Boston, memberships at crunch ( only gym in my area) where $100.00 bucks a month, and the place was mobbed. Not a single pro bb to be found.
The gym was well equipped, and even had a boxing ring.I worked out at the south Boston golds for a few years, and I was amazed how there was no bb's in the gym. Niche gyms that cator to bb's can make a lot of money, but on a national level, the tiny tits and cardio crowd drive the income of these bb's.