That's true too, just make both of them have to be paid for ? Combine both of them instead of having it in the shop just to buy. You make it kinda like a skill pack you purchase it and you have a certain number of games where you have a CHANCE of getting a mystery box. You may be lucky and get it several times within a 100 game pack purchase or you may be unlucky and not get it at all. There problem solved and both suggestions combined lol.