Students already get a discount. A pretty good one at that, too. You can get Final Cut Pro Educational for $500. Mac OS X Server for $500. These are $1000 software packages for 50% off...
The teachers and institutions get a few more bucks off, probably as incentive to boost Apple's share of the education market. Students having computers doesn't boost their share -- teachers and institutions having computers does. Yes, for all intents and purposes it seems to be a marketing move that alienates students, but you have to remember -- students already get a damn good discount on hardware AND software. Ain't no free lunches at Apple, but they'll make it cheap enough for you.