A gym with loads of cardio equipment is going to attract casuals. People are going to be put off if they see that there's only a small section of cardio equipment, whereas lifters are going to join the gym if it has the equipment they need.
If it bothers you, there are plenty of gyms that cater to lifters a lot more. I'm a member of a Pure Gym and a PAYG hardcore bodybuilding gym, if you go at the right times then the chain gyms are pretty empty though.