Hi there!
Considering the Hearthstone shop setup, I think both Bliz and the players would benefit from a Black Friday sale.
I think most of us want a particular Alternate Hero Skin that we don’t have. Given the huge total number of skins available, the three per week may have a player waiting quite a long time until the one he or she wants is offered. Why not make a large bunch of them available to buy for two days? It’s a limited time offer that will quite certainly please the players and guarantee Bliz a boost in sales. Everybody wins.
Aside from the Alternate Hero Skins, the whole concept of the Hearthstone shop is built around various limited time offers. Why not cook up a bunch of card pack or Legendary card bundles and offer those? They get offered once in a while anyway, like they were yesterday, so Black Friday would give another shot for people that might have missed what they wanted, or at something similar.
We benefit, Blizzard benefits, everybody benefits.