Why are Counter Strike cards so cheap ?

you get 1 card for every 4 keys you buy from the store. and CS:GO trading is done mainly using keys. i have earned more than 150 CS:GO cards until today..

Supply and demand. Mainly supply.

Because it's such a popular game.

Cheap badges and level ups if your into that kind of thing.

There's TONS of them, thanks to cases-opening-people who buy like 200 keys in one day, giving them around 50 card drops.

I didn't ask that question but I want to thank everyone above because they solved a mystery for me! :D

1. It's a popular game.
2. You get a card for every $9 spent in micro-transactions. I have earned more than 800 cards reselling keys on the market, while it was profitable (now it's not worth it).