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After a quick count (including some dulpicate copies of PHBs and such) I have 306 books. If I added in 'stuff-I-want-to-buy-now' it would be over 400 .
I'm not far from it. Over half of mine is A/D&D, the rest is made up of various WW games, Star Wars, Star Trek, Cyberpunk, Shadowrun, Rolemaster/MERP, and so on.
I've been playing since 1986, so I have a ton of stuff.
To count it would cause me to reveal to my wife all my hiding spots for books. A yard sale would quickly ensue. In the hundreds, for sure. Never sell toys to buy toys.
I'm down to about 300 books these days. I got rid a few hundred last year. Now, It's most d20 stuff, a select colection of oder D&D stuff, and one other company that I really enjoy their products.