If it brings traffic, it means it attracts people attending the events it's hosting. To me that's the main (or direct) purpose of it, and that (be able to host

If it brings traffic, it means it attracts people attending the events it's hosting. To me that's the main (or direct) purpose of it, and that (be able to host large events) is what differs big city lifestyle from others, at cultural level. I consider "commercial or housing development" a plus, than the purpose itself.