This thread succinctly sums up why I hate DRM.
Whatever reader I have now, no matter how cutting edge, one day (and maybe not that too far off) it will be obsolete. I buy ebooks to last. I may not want to re-read an ebook next year, it may not be 10 years until I pick it up again. How can I be sure that it will still be compatible with my favoured device then? And for this publishers expect us to pay the same or sometimes more than for a p-book. Come on - who are they kidding?