Hmm.  I've got some games I've bought specifically for a game I wanted to run, or a game I was playing in, and there's stuff I've just picked up because it's 'cool'.  I own a bunch of splatbooks and the like for games I don't actually own, either because I was playing in a game at the time, or because I wanted the material inside for another game I was playing/running.  I don't own a lot of books, relative to most gamers I know, because we're all very trusting when it comes to lending the rest of the group our stuff...

Own and played more than a one-shot:

BESM 2E (and some sourcebooks)
BESM 3E  
M&M 2E (And Several Sourcebooks)
Many oWOD Clan/Tradition books.
GURPS Warehouse 23 (used as sourcebook for BESM game)

Own and played one-shots, playtesting, etc:

Robotech (and many sourcebooks, which now supplement my BESM Mecha campaign)
Feng Shui (I strictly speaking don't own the actual rulebook, but my landlord does.  Between us we own every Feng Shui book I know of besides the Jammers, Lotus, and Architects sourcebooks, most of which are mine)

Own and have done nothing with:  

Q'in (A birthday present which I only got middle of last month, so doesn't really count)
Pokéthulhu
Werewolf the Forsaken
nWoD Tales from Precinct 13
TMNT and other strangeness

Off the top of my head, that's everything.  Proportionately speaking, Ive used a lot more of my books than I've not used, which I imagine puts me in the minority.

Quote from: BalbinusSheesh, any thoughts on that list?  It seems quite weighted on one end.

I'm an impulse buyer?

QuoteIs that the original series LUG Trek by the way, out of casual and passing interest?

Yeah, TOS.  I have actually sold it already as well. It just didn't grab my interest.  It only cost me a couple of bucks on ebay in the first place, so I don't feel bad about taking the chance to check it out.

Games new to me in the past two years . . .

Jags Wonderland
Jags Have-Not
Hearts and Souls
Cold Space
FTL Now
In Harms Way
In Harms Way - Aces In Spades
Black Dragon - the Land of Laeyon
Earth AD.2
Coyote Trail - and all its add-ons

Games I've played:

Jags Wonderland - we played about seven sessions of this, in total. If I had more commitment from my players, I would have continued to run this game, but probably using the Jags ruleset instead of the funky little homebrew mechainc we used.

Hearts and Souls - we played a one-shot game and had a blast! I'm not really into supers! RPGs, but Hearts and Souls was heaps of fun.

Cold Space - I am still playing Cold Space and enjoying it immensely. I've been running the campaign for over a year now. Unfortunately, I'm using FTL Now (the extended version of Cold Space) at all because I've developed my own alt-present/future.

Coyote Trail - this is definitely one of my favourite Western RPGs, especially when you want a break from alt-Western stuff. Generally we play one-shots or short series of games.

Games I hope to run soon: In Harms Way - Aces In Spades

The remaining games on my list are great games, but time is limited.

The one game I've ever actually bought but haven't yet played at all is Engel. All the others I've at least tried out briefly: during the last year or so I've run Nobilis, Praedor, Sailor Moon, and Puppetland.

My percentage would be pretty low in terms of games actually played.  However, I do read and enjoy every one...so I am using them.  Just often not as games...