Because most 15 year olds who already have their life figured out, turn out either wrong or boring.

And the 15 year olds who don't wannabe something, generally don't end up interesting either.

But these are perspectives from a few decades later. At the time, I too had strong opinions about people who wore their aspirations on their sleeves (or between them). We called them poseurs. Because we had more opinions than knowledge. Like 15 year olds. :)

(Aside: you have to admit though: The Zildjian logotype is really good. Also, you'd often get a free t-shirt with purchase ... so, it was hard to tell the legit from the poseur without watching them play.)