I agree that the lower tiers need a better way to move up. If it is that rare for some events during the week it has to happen to keep them moving forward at a reasonable rate and it will bring more moderate purchases to the game.
That does not solve the problem of all the beached whales. They need a reason to spend money. Right now it is not there. A few extra weeks on walkers or cards does not cut it. They want top prizes or at least something to fight for. Purple crystals are not that thing.
I don’t understand why foils would be in any way desirable in digital form, but hey, if it gives something for people to spend currency on, all power to them.
I like the idea of foils too, since it gives you a way to show off to your opponents that you ranked highly in events. As of now, there’s no permanent record of winning in events, unless you use a card that was an exclusive reward in the set