Kristian: I must have been imagining playing various games on Steam like Bioshock Infinite or Shadow Warrior Classic Redux then.
It's a general rule, there are rule. For something interesting I'd suggest you check out statistic on Steam Achievements, specifically the number of people who own games which they have only gotten one achievement (like the introductory one or something).
I mean, just look at the "card trading", items and all that crap Valve keep putting out. If anything Steam has proven itself the game platform for people who will do just about anything but play games.