I voted Colossal and that might be pushing it but not by much. I do have a room, which my wife is NEVER getting back, with a total of nine six foot bookshelves, with four of them or so gaming. Not counting minis, which I have a lot of those as well (metal and plastic), I figured I am in the 900s with my magazine collections as well. Further, I have printed off some PDFs and have lots of extras, such as campaign coins, fantasy money, item decks from Paizo and other RPG accessories. Then, add in the two dozen or so board games I have, most RPG related some not, and I'm sure I'm still over a thousand.
This is after three major purges of 200 books each time. Although, maybe I can't call them major anymore, at least as a percentage of the whole I had.
Further, this is not counting any books that I use for gaming but aren't gaming books, such as gun reference books or history books on the Inca or Mayan for my Dark Sun campaign. That gets me more as well. Further, I also have some other handout type things, such as beads for gems. So, counting physical items, even not individually, the coins and other items add up.
Most of it is DND or related, in terms of setting books but I only kept 3E rule books and a few other rules books here and there, such as Rules Cyclopedia.
After that, it's White Wolf and it might be close between WoD that I kept (mostly Dark Ages) and nWoD and Exalted to the DND stuff.
I also have some misc stuff, like Star Wars Saga and various other d20 or other game systems. I have tried to pare it down to WW and DND as those are the systems I play the most but I did keep my Alternity stuff as well.
I can't use a lot of it at once, unfortunately, but I have used most of it and am glad I do have it when I run those games!
(for gaming products) from 1977 to now and 20 GenCon, I have picked up a lot of stuff.
