It seems they have sold over 1000 booster packs just over the past 2 days, giving over 500 packs per day. I think this is a great achievement for such a small Indy game studio, as long as it will at continue at this level.
I expect they will limit Reward Edition cards, but I think they are creating them too fast. Every season brings changes, we'll see how it works.

I have my Deck round about at Level 4, just good enough to take a peak into the Gold League and then get slaughtered.

Just feeling the same. This is why I've just posted League Format Improvement article.