Core Books get used a lot. The only adventure I own is Saltmarsh, from which I ran the Sahuagin trilogy and used the town.
Edit: just realized this was general, not 5E. I don't have very many of my original books, keeping only the DMG and a bagged copy of the Tomb of Horror. I owned and used all the 1E books. I owned the core 2E books and a lot of adventures. I only owned the core 3E and 4E books, finding them to be lacking. I had a ton of BECMI adventures, almost all of which saw play, even the ultra high level ones (Maelstrom, Five Coins for a Kingdom, Vengence of Alphax, and Twilght Calling). The only book I got minimal use out of was the Rules Cyclopedia, since by then we'd stopped playing BECMI completely.
Edit: just realized this was general, not 5E. I don't have very many of my original books, keeping only the DMG and a bagged copy of the Tomb of Horror. I owned and used all the 1E books. I owned the core 2E books and a lot of adventures. I only owned the core 3E and 4E books, finding them to be lacking. I had a ton of BECMI adventures, almost all of which saw play, even the ultra high level ones (Maelstrom, Five Coins for a Kingdom, Vengence of Alphax, and Twilght Calling). The only book I got minimal use out of was the Rules Cyclopedia, since by then we'd stopped playing BECMI completely.
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