I am of the understanding that buying books online is hardly worth anything because you don’t actually own anything. Maybe you own the digital file? I’m not sure. I don’t trust the longevity of it, though.
I’m told a lot (mainly by my Dad) that its a good idea to print those out to keep them. However, I’m talking about books that are easily 200+ pages.
I don’t know if its worth the ink or money to print them out. At that point would it be better to just buy a book?
I print and bind RPG systems that don’t actually come in a print format. Other than that, I save all of my ebooks in epub format and back them up. Storage is cheap and ebooks are small. There’s no reason to print anything out that you don’t actually need printed.