For some reason I could think of Squash being more entertaining than other sports like...say...well let's take soccer since I believe most people know that sport whereas not everyone knows squash.
One of the very good things about Squash is that you don't really get bothered with it on TV. The other is that if you actually go play it you get to improve your hand-eye coordination which you're not really allowed to do when playing soccer. And one very big plus for people like me. Noone wants to play anything with me anyway, but you can indeed smash that ball against the wall without an opponent, beats badminton and tennis on that "feature".