Horoscopes

Some people read horoscopes, compare horoscopes, ask about each other's signs, talk about the compatibility on the basis of horoscopes, etc., in a way that gives me an impression that they really believe in what they are saying.

I sometimes ask them whether they really believe in the horoscopes. The answer is almost invariably "no, it's just for fun".

Can anyone explain to me what kind of fun is there? (The people in question never do.) it's not that I disapprove of the kinds of fun that other people have and that I myself don't enjoy, it's just that I find this particular kind of fun very hard to understand.