Sometimes I want to get more into paper, so I have an excuse to buy pretty notebooks. I do that about once a year and never end up using it right now.
Secondarily, hearing about our risks of EMPs from solar flares (or even in war scenarios), or in case of electrical grid collapse (a not-impossible scenario in some countries), paper is the only way I'll have survival knowledge available to me.
My favorite indulgence is high quality thesis-like paper. Archival quality, with nice cotton fibers. Pair with some nice ink nibs or fountain pens... ahhh
Look for a ream of short-grain (bookbinding) paper. Other option is a ream or stack of 11x17 and have it yourself. Even a bit thinner it tends to be nice for writing.
Secondarily, hearing about our risks of EMPs from solar flares (or even in war scenarios), or in case of electrical grid collapse (a not-impossible scenario in some countries), paper is the only way I'll have survival knowledge available to me.