It luckily never affected the market because it would be bad for us and the sellers if it would, I really think that buying here on the forum is better because its cheaper and feels better..
Yeah, and besides some enthusiast gamers don't use bitcoin as payment in steam. They still uses fiat rather than bitcoin. But in my own preference. It is more convenient to buy steam wallet credits in bitcoins as its fees are much cheaper if you are going to compare the price when you buy a steam wallet card. Maybe because almost all gamers don't know about bitcoin yet that's why they are not using it.