I think that this makes sense if you want a physical copy (possibly in addition to the ebook); if not, then I think that you do not need to buy it and waste pap

I think that this makes sense if you want a physical copy (possibly in addition to the ebook); if not, then I think that you do not need to buy it and waste paper etc. When I want to read a book, I usually prefer a physical copy (and I am willing to pay for it, if I do not merely want to read it for a few hours at the library (if the library has a copy)); sometimes it is helpful to have it on the computer too, and in that case I would only accept non-DRM files, and possibly even piracy. However, some books might be difficult to find, or maybe I only want one page, etc.