The insane card devaluation is really an issue that needs to be fixed one way or another. Players not selling cards and holding up the prices is probably the most valuable behavior the game should reward yet it's almost completely neglected.

My favorite game mode would be one where everyone is truly on a level playing field and which can be played (at a cost and with a reward depending on the result) at times that I actually want to play the game and not because I have to or otherwise I will lose out on the rewards. I have a hunch for pretty much every new player that would come into the ecosystem this would be the same.