He means L4D2 Trading Cards, for those that don't know. Also note that you will only get 4 card drops for L4D2, the other cards you don't get you will have to trade with others. I can trade 1 smoker card for either a Boomer, Witch, Tank, Hunter, Charger or Spitter if anyone has any of these in duplicate.
I'm sorry I rather let people be informed what they are giving up so reading http://steamcommunity.com/tradingcards/faq would be highly recommended. Like Metallica said after all these are worth money. For those who don't want to read the whole faq, to sum it up: Certain games drop a limit number of cards Collect all cards to craft a badge and get rewarded with a coupon, an emote, exp for your steam level, and a background for your steam profile. The higher steam level you are the more friends you can have and optimizations you can do. When you hit level 10 you have a chance to get boosters that drop more cards, chances increase every 10 levels by 20% starting at 20%.(These are completely random on which game cards they give)
Stoned just wants us to give them to him, I'm just asking for a 1 to 1 trade of a duplicate card. The Marketplace seems like it's just full of people wanting to make a quick buck, all I want is a free trade and I'll never sell any of my cards.
i have extra cards to trade. I have some from left 4 dead 2, tf2 and half life 2. If you have double the cards to trade, just pm me and we can work something out.
I think they changed that so everyone can get booster packs, you just have a higher chance the higher level you are.