Thanks for the shoutout, Excavalier. I did indeed take 24 AP exams throughout my high school career. I wrote up a pretty lengthy post about why I did it somewhere on these forums. In short, I wanted to challenge myself to learn new things, and taking the AP exam was a surefire way to motivate me to follow through on the learning.
I ended up with a ton of AP credit, and I got accepted to what is arguably the top collegiate program in the U.S. for business / engineering students.
I'd say that for my goals, taking the exams was worth it. I learned a lot about the world, I have a lot of room in my schedule to take the classes I want to take, I learned how to work hard, and I got the State AP Scholar award.
As long as you're a well-balanced person, I don't see why you shouldn't go for it. I had a few long relationships throughout high school, played and coached baseball, wrote music, was politically active, etc.