On MTGO Treasure Chests
It takes money to get Hearthstone cards; I know people who have spent several hundred dollars and I probably spent about $100 myself. There is no way to get the cards you want directly either and no redemption or way of regaining money for your Hearthstone cards.
In other words, if the game is good, people will pay to play. But probably we all love Vintage more than the average magic player loves magic.