I really doubt the demand will be there for players to buy unlocked cards, initially maybe some who failed to get specific cards to a certain level. As a buyer you can easily put the price you are willing to pay at pennies profit compared to the unlock cost as there are many people who left the game and are going to be willing to unlock and sell at a tiny profit. The entire setup now is just stupid and it will make things worse. I wrote more about the idea today Here