I'd like to state my opinion regarding prize support. As a new Gemp player, my intention is to build a deck (decks, to be exact, one at the time) for competitive Constructed play. This I can do by buying packs or singles, and the currency for that is obtained mostly by selling the cards obtained from the prize support in sealed tournaments (by opening the boosters or selling single rewards).
However, certain rewards do not contribute to that goal. I'm talking about the common, promo and uncommon foils. As far as selling them is concerned, they are practically worthless. So I suggest replacing those common and uncommon foil prizes by booster packs, so there is a negligible chance of getting the necessary cards (or cards valuable enough to be sold), or giving the player a choice between the pack and the foil (for those who want to build all foil decks).
I'd also like to see the prize support for the sealed tournaments increased a bit in addition to replacing the foils with boosters.