There is no market on steam that gathers enough interest to continuously earn merchants $1k BTC on a daily basis. Sorry to break it to you, but you do know what the average steam user that purchases off sellers like this are, don't you? They're not some big shot, they're normal people that would struggle to find Bitcoins priced at an acceptable rate.
Have you heard of Samalex and Ether? They are the most well known traders in the CSGO market (I believe one or both has dwelled into the dota 2 market scene as well), and they would laugh at a statement saying traders gets daily sales in Bitcoins alone for $1k+. Considering the profit margins a normal trader sets (~10%), and obviously having to play it safe due to BTC's volatility, and then thinking how much of trades are paid with Bitcoins and Paypal. The latter would outweigh the former by a huge margin, you're essentially saying that from BTC sales alone these sellers make ~$100 a day, which doesn't sound out of the ordinary, but there's no way it's constantly from Bitcoins alone. Even if they sold $2-3k in items (assuming they make $200-300 profit daily) on a daily basis, I'd love proof that 30-50% of their sales are due to bitcoins.
Russians getting a cheaper price on games means nothing. Those are region locked. They pay the same price for keys. The one time there was an error due to Rubles prices being volatile due to the recent tensions, they got keys off the market for $2.15 a piece off Steam itself, that was quickly fixed on the same day. There is no way you can tell me that Russians are bigger traders than the most well known traders internationally. My statements above were also assuming those traders you mention are as big, if not bigger, than people like sam and Ether.
Here is Ether, at his peak, mentioning his sales
here. 1200 keys in 2 days. You're telling me that Russian traders sells the equivalent of 500-600 keys on daily basis using Bitcoins alone when it takes one of the most well known traders that long to sell it while accepting various payment methods. I'd be surprised if Bitcoins even accounted for 30% of anyone's total sales.
It took you 2 minutes to read my post and come up with an idea to add to my post. That alone tells me your opinion wasn't even thought out very much.