This thread is making me want to do a detailed inventory of all my RPG stuff, plus reorganizing all my RPG PDFs. I have a crapload of physical books because I prefer those at the table, but my PDFs outstrip that by far, unless you don't include short stuff like you'd get on the DMs' Guild.
I'll have to do some counting tonight.
I'd needed to inventory mine for a while as I think I need to cull it down a bit more. There's still some 3.xE books I should sell as I'm not sure I'll ever use them.
My PDF's are sort of organised, but I think I need to go through and inventory them as I've accidentally bought a couple of PDFs twice before!