AttObl: Okay guys, I'll try running two games at once so that I can idle for cards.
Hopefully I'll get some card drops when I get back home.
skeletonbow: I wouldn't do that... I read somewhere that if you have more than one Steam game running at a time that it is aware of that and intentionally reduces the frequency of card drops significantly on purpose to stop people from trying to game the system just to get cards. I don't remember where I read it but I believe it was some official Valve statement somewhere. Not hard to google and find likely if anyone is concerned much though.
Personally I find games drop all of their cards within a few hours of play anyway (whether you actually play or not) although I never purposefully leave a game running for card drops (I don't really care about them really). So it's not that hard for someone to get all of the cards in short order anyway.
You are right. When I got back home, I only got one card while running two games. I will run each game one at a time to get the cards from now on.
Also, the community choices are pretty good right now. On one hand, you got Metal Slug 3. On the other side, you have ArmA III and Insurgency.
I voted for the latter.
And another edit: Is Risk of Rain any good? It's $2.50 on the Flash Sales.