Why don't you give awards like gold bars or powerful boosters, or even multiple boosters when a player reaches high levels as a reward for persevering and sticking with the game for so long. The reward could be commensurate with the level achieved. I am at level 4750, and I would feel more connected to the King family if I got rewarded for achieving such a milestone. The booster wheel doesn't feel like much of a reward because every player gets that.
