I'm well over 250. Traveller alone, given CT, MT, TNE, T4, and MGT1, plus some third party stuff for CT and MGT, pushes a hundred. (CT alone, no 3rd parties, is at least 50.) Traveller is, of need, across two crates.
I've a bunch of FASA-Trek - half a crate in with later Trek, and the rest in a smaller tub, because they were gifted to me by someone while the crate was still in a different state.
I suspect I'm close to 1000 physical books, most of which are game related. I keep them organized by system in milk crates (from defunct dairies). One crate is nothing but Dune novels and McCaffrey novels, all in hardcover.
Just in my current LoS are 35 NOT in use; two will see no use, either... the Marvel playtest and TOR 2e Collector Ed. The TOR 2e Starter Box has been opened, to put in the replacement dice... and looked through. Not going to see use, either. Just out of LoS, a crate of WFRP1e, with all of TEW in the consolidations, 4 of the 6 Doomstones volumes, the companion, both apocrypha volumes. Also, all 3 current volumes of ALien, plus the adventures, and Blade Runner and its starter, oh, and vaesen and the first adventure book. Plus, under the notebook, one of my hardcover D&D Rules Cyclopedia. (I've at least one more, maybe even 2 or 3 more. But they're in the storage along with most of the D&D Gazeteers.)
THis doesn't count boxed non-RPGs, either. Counting the two non-game books, we add a bible, a dozen manuals for various pieces of tech...
So, in my bedroom, about 50 books. And that's maybe 20%, if even that much, of the book count.
I organize my PDFs into folders by system, and if the system is used in multiple games, those are in subfolders; a few get cross-linked - STA is in the top level, but has symlinks in both the 2d20 and Trek folders.