The problem is that if we released the ones we have, for example, we would only ever sell one copy - they would be available over the internet immediately afterwards. We reserve that kind of stuff for classroom use only.
Your intentions are obviously honourable, but it's a lot of work to have it abused like that, and for a relatively small market and return.
And before you ask, we have looked into the Ipad, but getting past Apple is even more work!
