Cultural oddities - Club soda

As I go to different countries (or even the same countries at different years), I usually find something different and unusual that I cannot always explain. For instance, here in Qatar, practically every corner store has a shelf of cans of club soda, alongside the usual soft drinks. It is easier to find club soda here than it is in the US, UK or India, where people have an excuse for requiring club soda to mix with their alcohol. Qatar, on the other hand, is mostly dry. Alcohol can be bought, but only after a laborious application process. So what do Qataris do with so much club soda?