When I was young I used to be a soda freak; I could drink about four to five pepsi a day. Nowadays, I can't even smell the darn thing anymore; there really is such a thing as an ''adult sense of taste'' I guess.
I used to get water at resturants, but sometimes the water tasted funny. Club Soda ensures that you get the same quality almost every time, and you don't get a 'heavy' beverage. The lime is just for flavor.