Well I can think of a few reasons they wouldn't put a squat rack in:
If its a chain/franchise, they probably are only allowed certain approved equipment.
Flooring strength, building structure/noise/space
It's a liability because it increases injury amongst people who don't know what they're doing or ego-lift.
Weights are intimidating to newbies/casuals.
Powerlifting has stigmatisms of steroid users and aggression... not good when your:
Target audiance. Health-club type family fitness centres aim at families, and cardio bunnies who are more concerned with BMI and "health" than weight and strength power and competiveness.
The target audience is the sort of people who "work out a couple of times a month" and jog off that extra chocolate bar, not the people that routinely train 3 times a week. I think I recall seeing a statistic somewhere that 60% of gym memberships go unused.
TLDR health club gym wont get a squat rack because of paperwork limitations, and because its aimed as casual overweight people.