Agree.
Also I'd go as far as to say that the game allows very little room for changing decks. It costs too much electrum (gold) ... nearly 1000 to build a secondary 30 card deck (a dragon costs 109!)
If the selling abdbuying prices for regular bazaar cards were equal, then it would be easy, I'd sell all my ather deck including upgrades (but not rare cards), then I'd rebuy them all in a different color. THEN the game would be fun, I would be able to experience the game fully instead of being locked in the set I'm currently trying to improve.