What is the reward for not unlocking, except for a little price reduction?
I would like a reward for keeping my cards soulboound, and by so helping keeping up the value.

As a person who has spent some money on this game, and been around long enough to have bought cards before the price crash. I don't know if I want to spend much more to be eligible for rewards.
Right now it seems you have to spend half a fortune to get some decent rewards.