I have 23 games in my library, but only 9 are purchased; the others are free. From those 9 that I purchased, 4 of them were part of a LucasArts classics pack that was like $5.
My rule is that a game should be $5 and less for a purchase on Steam. Though once I did spend $10 for Killing Floor because I thought it seemed good, boy was I wrong. It's a dumb grinding game where the developers have just abandoned it. Out of my few purchases, the Killing Floor purchase was the worst; a pathetic game and purchase, I remind myself of it so I don't make the same mistake again.
Why? Because with Steam you can't sell the game, you can't get rid of it for some money back. That's the worst part about Steam.
It's stupid... game companies have DRM that says you can install it on up to 3 computers (or some other number) ... but how can you do it with Steam? It's tied to your account? So it's stupid. You're going to share your password? Steam locks games to single users, you can't share or trade or even sell....... Steam is very restrictive in this way and I can't support them with higher priced purchases. I might as well walk down the street in search of a poor man selling bootleg games than to purchase an extremely restrictive product from Steam.
Are you smoking rocks dude?
I need some of those rocks maaaan WAAHHHH