There's no reason to own that many games (unless you like collecting them) or even have a remotely large backlog. You guys seem to have the same problem I have in that they aren't enough interesting games that make you want to play them through entirely, yet unlike me, you buy and store them in a backlog regardless because you get "good" deals. Figure out what games you want, and aren't just "oh hey it might be cool and it's only $19.99."
And it's not even a money thing. Unless a game has my interest truly captured before it is even released, I'm not going to touch the thing -- there's nothing shittier to do during a day then to waste time on a game that is merely "okay."
If you have trouble staying focused on one game, it's probably not your cup of tea. Get into MMO, get competitive with a fighter, find an online game with some friends -- something that you can always fall back on while waiting for titles that matter. I may sound uptight on this, but I'm a broke college student so when I play something, I make sure it's something great.
You can always pick up those "eh" games (like for me, the new Castlevania) for like $10 less than a year after they release. You're usually always getting jipped by jumping on deals for games you won't play. I'm currently plowing through games left and right because I'm on break; beat starcraft II, 20 hours into FFXII, 10 hours into FFIX, keeping my SSF4 skills on point, playing LoL with my buddies every so often, just dug myself into Prince of Persia 2008, halfway through Super Meat Boy, and since I still have Baldur's Gate II and Persona 3 Portable, I won't be spending a dime until Tactics Ogre comes out in Februray because that shit is going to be amazing.
That's how I work, anyways.