keep in mind, that apple is giving the students the discount as a privilege, and not some "oh! but it is based my constitutional right to receive these deep discounts!...blah blah blah."
so yes, you can buy the computers at a discounted price without a limit, just goes to say without warning:
"They don't check if you bought a computer or not, so it doesn't matter. They just don't want you to start a business based on it." -alphaod
besides, the discount that is readily now, is only on all laptops and 22'' iMac, will u get a free ipod touch. but you only get one.