Nope, the MacBook comparison was a matter of functionality. Most teenagers (or people in school) will be better served with a MB rather than an iPad. Try writing an essay on your iPad or creating a powerPoint presentation.
And I doubt that MANY teenagers aged 17-18 have an iPad. I wouldn't say a lot of any aged people have iPads....really they aren't nearly as common as a smartphone or laptop. Come on now.
Honestly, the functionality of an iPad for a student really isn't great and realistically most teenagers can not afford to buy both a laptop and a smartphone and an iPad. Some can, but MOST can't.
and good luck taking notes in a high school class with an iPad. Not very likely either.