The other constraint is the physical space. If I didn't have to worry about that, I'd increase my budget. I can afford to spend more, but with books spilling everywhere in my apartment already I try to keep things within reason.
Unless I break the DRM, I'm tied to the vendor. I have no guarantee that I'll still be able to read the book in 20 years, or read my margin notes. If I'm less fond of the book, I can't sell it when I'm done with it, or give it to a library.
Finally, I think the public benefit of getting more books in more people's hands shouldn't be discounted, given that the Constitution says the whole purpose of copyright is "To promote the Progress of Science and useful Arts."
Unless I break the DRM, I'm tied to the vendor. I have no guarantee that I'll still be able to read the book in 20 years, or read my margin notes. If I'm less fond of the book, I can't sell it when I'm done with it, or give it to a library.
Finally, I think the public benefit of getting more books in more people's hands shouldn't be discounted, given that the Constitution says the whole purpose of copyright is "To promote the Progress of Science and useful Arts."