BBM has a certain amount of exclusivity factor to it that lends itself well to teenagers

Really? I can't see it being chosen over an iPhone or many of the other phone by kids except for those who act like school/life is a job.

I see it in my city, too. BBM is very popular with the high school and college crowd, so they all seem to prefer ANY BlackBerry over an iPhone, their argument being that they can't use BBM with out the BB.

Among the people I know with them none of them are the "everything is a job" type. Honestly, it may be a random result of the people I know, but I'm not sure what it is.