Due to some recent confusion on what the new Steam Trading Cards are all about and how they affect you, i decided to take some time to explain just what they are. I'm going to use Skyrim as an example for this as we can all relate to it.
This might be long, *deep breath*
Steam has always had Achievements. Beat certain challenges in games and get a little picture to prove you did it. However Steam has never given you points towards a profile level, unlike other gaming networks like Xbox live, Playstaion Plus or even Kongregate.
Now Steam has added in a profile level, but attached it to badges, not achievements. For 98% of these badges you craft them with Trading Cards. To collect Cards, all you have to do id play the game. With every game you buy that supports Cards, you get a certain number of cards drops. About 1/2 of the total number of cards to collect.
What can we do with these cards?
You use the cards to craft badges which give you random prizes and always give exp. You might get a new emoticon for chat or a discount on a different game. It's random.
So here's how it works so far:
You buy Skyrim --> You get 4 card drops ---> While playing you get cards
Now we need 8 cards to craft the Skyrim badge. We get 4 through playing. This is where Valve made a genius decision. To get the other 4 we have 3 options:
1. Trade with friends. You can trade your cards back and forth between friends.
2. Wait. By playing the game every week you enter to win a draw for more card drops.
3. BUY THEM. Yes, you can buy and sell your cards on the market.
So lets say I take my card and sell it for 0.25$ to a another person. Valve gets 3 cents. At 2$ Valve gets 25 cents. Valve gets a cut off every single purchase. EVERY SINGLE ONE.
That's what these cards are all about. Money. Valve say a way to get thousands if not hundreds of thousands of its users to spend money on something that could do nothing.
So. Why should you spend your money? Let's find out. Through my purchases during the Summer Sale, I have got enough cards to craft a badge. let's see what I get for crafting it.
I received: 100xp, A background, An emoticon and another trading card. I also got an extra 5 friend slots.
Whats even better, is the the background and emoticon are sellable. So Valve can make even more money off this. And I got another card, so that i would incentive to craft the second level of the badge.
I salute you Valve. you have came up with another idea as big as hats.
EDIT: Apon farther looking. It appears that valve splits the money with the makers of the game as well.
tl;dr version: Ignore them, they are mostly about money.