I think for prizes, I dont plan on the prizes being worthy to really go for it (like a Hunters block Masterworks set, or 800 Reflections boosters), more like a novelty promo specifically to promote the new League and PC.
Money is out of the window, as if I (or the PC) make any profit, real or imagined, Decipher could have my bum.
Unstructured seems popular, but if the player base grows, we can have a Pro League and a Casual League... but we are talking many months from now.