It isn't necessarily. Like Ameesh said, what makes you think they are better?
In the case of here in TX - it's true IMO. All the Bally's here are small, and very few locations. (The closest one is 20 minutes away from me minimum) From what my friend also tells me - there's a lot less equipment and at least the one he goes to, the equipment is older.
In the case of 24, I have 2 within 5-10 minutes from my house. I have 2 within 5-10 minutes from my college when I went there. I have 1-2 that's close to all of my friend's houses.