This is what is said in FAQ
What about free to play games like Team Fortress 2 or Dota 2?
Free to play games drop game cards based on your in-game purchasing history. If you've made purchases in-game prior to the Steam Trading Card Beta, or if you purchased TF2 prior to the Free to Play Update, you'll have 4 or 5 drops available for these games. You'll receive more card drops when you buy items in game, approximately one card drop for every $9 USD spent.
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I bought some dota 2 treasure keys long time ago. Spent around S10, i got 4 cards, won't drop any more as written on the trading card page, so it's S2.50 spent for 1 dota 2 trade card i think.
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So everyone knows that you can't get DOTA 2 trading cards unless you buy something. But how much do you have to buy to get the trading cards? I've heard that you have to buy $9 of items and I've heard that you just have to get premium by buying the cheapest thing. Anyone know for sure how much you have to buy?
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