So far I haven't even bothered with DRM-protected books; it's just too much of a nuisance to be worth it (especially since my computer runs Linux). If DRM-protected ebooks were reasonably cheap so that I wouldn't care too much that I might lose them due to me switching computers/operating system installations/reader devices too often or due to possibly changing ebook formats, then maybe I'd think about it. As long as I can buy a printed book for the same price that will last me a lifetime ... well.

I bought my ereader mainly to read fanfic and free classics anyway. :)