Well for one things it gives you pleasure. You could also say "what's the point of listening to music" or "what's the point of watching comedy". Other than pleasure, as a generality, you might read because it makes you feel good to do so.
I find that a key to good mental health (that works for me) is not to question what harmless things make you feel good and why. If I did that it would make me unhappy. Just go with the good feeling.
One thing that I'm sad about is that I don't get the same pleasure that I used to from browsing books at Barnes and Noble. With the internet there is to much to read already. I don't find the same utility that I used to from books that are essentially a single perspective (at least the ones that I used to buy, non-fiction).