Sorry, but this kind of comment really winds me up. I can't think of any offline example where somebody walks into a store and says "Because I'm a student/a charity/poor/non profit/any other excuse, I want you to sell me what you're offering for 10%/1%/a laughably small % of what you normally charge" yet I see that all the time in the domain world.
I get emails along the above lines almost every single day, and I really wonder what planet the people emailing are living on!
Choosing to GIVE to charity is one thing (and a very laudable and worthwhile action) but suggesting that one should throw basic business commonsense and economics out of the window because the other party to a transaction can't or doesn't want to pay market price is ludicrous.
Sadly, that doesn't seem to stop the emails coming!
Added: yes, I know that for instance students get discounts in many stores, but the discount is always a small percentage of the overall price, and the store-owner has already done the math and figured that the repeat business/word of mouth/remaining profit after the discount warrants offering it in the first place.