Do you only buy games from/that redeem on Steam?

Only?...NO

Mostly?...yes, because I kind of like to collect (and also play them) and keep them in one place :)

I also have battle.net. Origin and uPlay are staying out until they or the companies behind them get serious about DD.

I hate any kind of Drm except Desura and Steam

Most of my games are on Steam...just a few are DRM free.

mostly but I have recently bought some games from GamersGate for instance my current giveaway is for a game on there that redeems on steam

If I get it for PC, then yes only those that redeem in steam. Just makes management easier and hopefully keeps my keys all safe and in one place for years to come.. I do have an 360 and PS3 too, though.

No... but mostly. Steam, GOG, and amazon. Used to do windows live and D2D (gamefly) but no more!

Pretty much, yes. I'd prefer to keep my games funneled to one location, rather than trying to remember what games I have and which service I have to download it from. Plus, I have more faith that Valve will stick around than a number of other random sites.

I always buy games that can be redeemed on Steam.

Desura is just meh. Origin is a crap.

Steam or NO PURCHASE!

Mostly yes. The games retails for a much higher price in stores where I live. Why should I pay $5 more to make a trip down to a mall and get a box for my game?

It's just become too convenient to be able to download from Steam instead of keeping track of my discs. I still like boxed editions if something has bonus items that I consider worth it. An RPG with a 3x6ft cloth map? Yes, please. Fallout New Vegas had an edition that came with Caravan cards and a replica Platinum Chip. Another winner. Gotta do retail for that, even if I could have gotten it shipped to my door. Respect.

My digital distribution sources are Steam, Desura, GMG, and Amazon. Preference is mostly in that order.

Pretty much, yeah.

Between frequent steam-sales, growing game backlog, and diminishing recreation time, there's little need to look elsewhere.

Yes, because convenience, and because I'm a shallow excuse for a man who likes to look at his growing Steam library of stuff he never plays and giggle.
Unless, obviously, the game is not on Steam. Most of the growing selection of GOG, for example.

Pirate all the way.