Well I use the nodrm plugin and Calibre to strip the drm from all my Amazon ebook purchases and back them up both on my own machine and to the cloud storage provider I use. Only reason I buy Amazon’s ebooks is because they are normally the easiest to strip of drm, and very few ebook authors don’t use drm.
Physical books are certainly nice, but id rather save the space/weight for things I cherish instead of things I merely own so I can consume their content whenever I’d like. Books are for reading, not for showing off.