Splinterlands also allows staking of the coin you earn from winning to earn more of them, and vouchers, and, if my understanding is correct, one's stake in the game will eventually determine the number and level of prizes that can be earned. I feel like it's very similar to what you've indicated LEO might do regarding premium service offerings based on stake weight. I really hope to see this approach spread to other communities. I think the next 6-12 months on Hive are going to be very exciting.