I often buy games that don't use Steam since I like to buy old games in their original packaging. Mount & Blade is on Steam, but the disc version just uses a CD Key that can only be registered a few times per month. I don't really hate Steam, but do prefer buying my games in boxes. I will use Steam sometimes and have bought games off it plenty, but still just prefer opening a box, putting a disk in a disk tray, and listening to the svcker spin as I game.
I do have a used copy of the HD version of the first Serious Sam game. Since it is a version from India, I am keeping it just because I've started adding a sub-collection to my game collection. That sub-collection is games with foreign ratings as long as they have English as a language choice. Steam is, sadly, the only way to get the game S.T.A.L.K.E.R Call of Pripyat while avoiding the horrid thing known as SecuROM. I refuse to let such poison be near me even if the game is good, so I'll just get it off Steam instead when I get a better computer.