I quit gaming last year. I've been working on other things such as selling many personal possessions. For instance, I sold off most of my comic collection.
Relevant to gaming, I sold a two-foot-tall stack of D&D game rule books. I sold all of my 4e books. I sold all of my 3.5e books. I sold all of my 3e core rule books. I sold all of my Knights of the Dinner Table comic books.
I kept my D&D books and modules published before the year 2000.