Umm lilwing, that's certainly not true. One of my better friends at B-school loves investing. He thinks there is nothing more exhilarating than moving 10 million dollars with the snap of a finger. I don't doubt him either, since his dad retired at 40.
I personally understand how you feel, because I had the choice between going to b-school versus going to a liberal arts college, and I was pretty passionate about psychology, philosophy, and economic theory. I had a HUGE debate with myself over liberal arts or b-school, and was in a limbo for 2 weeks. But in the end, I decided that I want to make a difference in the world one day, and you can't make a difference if you just know the theory but not the practice.
But also, I'd always wanted to go to b-school because my parents basically went from rags-to-riches through entrepreneurship and hard work. You probably don't know what it feels like to take your kid to McDonalds on a friday night but only buy your kid a meal because you can't really afford buying one for yourself. I've also heard my parents talk business day in and day out for as long as I can remember...
But of course I've also asked myself, why, if my parents are well-off, should I bother with going to business school? I wanted to go to business school for the practical skills. You won't find anywhere else that'll teach you how to get ahead and achieve your goals.
I would have done economics + philosophy at the liberal arts college, but now I'm doing a BS in economics + a minor in philosophy, so it's basically the same. Except business school kids are more cut-throat and the curves are insane.
Business is also about creation. Especially entrepreneurs. I admit I don't know how people put themselves through accounting, but entrepreneurship, financial theory, operations theory, and a whole load of business theory, is about creation. There is nothing more satisfying than seeing something you built, grow.