not really. Student Editions are usually cheaper to encourage students to purchase the product. Thse that are free handouts are, yes, to encourage later sales. But I dont think you can draw a comparison. A piece of software is usually adaptable and reusable in the future. A lot of film and music is just dropped (tastes change etc.).
I doubt the number of youngsters who pay for music once they have the means is huge. Would you pay for the Spice Girls song you downloaded 4 or 5 years ago and havent listened to for the last 2 yrs. No, probably not - but you might have had 2-3yrs enjoyment out of it... where do you draw the line?
I dont see any justification for downloading music you cant afford when there are free sites to listen to it on.... it's not as if that lack of funds is depriving said person of the ability ot hear and enjoy the song. It perhaps does inhibit how and in what context they can listen to the song (i.e. no ipods etc.).