I bought my reader thinking the ebooks I bought would be more affordable and that's where I'd save my money. Also, I think electronics and electronic waste has it's own environmental hazards. Though there is no doubt creating and transporting paper books does cause harm to the environment.
Also, I think books that have been out for over a decade should not cost 30 dollars at mobipocket.
It's the reason I go to the darknet for many books. I'm willing to pay a reasonable amount but not 30 dollars for a book that's been out since 1996 and is in paperback.