e-books versus tree books

I like to read novels every now and then and our bookshelves at home are a testament to that. However I have never been a fan of clutter which is strange as wargamers are possibly Kings (or Queens) of clutter when it comes to paints and miniatures etc and our books cases are starting to fill up. Reading is usually my inspiration for more wargames purchasing. On the net in blogs, wargames