Over-Level Cap

So levels end at 30 right. Why not add "Over-Levels" or something so that it keeps the mechanics of the game the same, but having and over-level cap of say... 100, every 10 levels you'd be rewarded a new icon or something, maybe some extra iP as well? It would give people another reason to play even more, and it'd be a cool thing to keep track of while you're not in-game. Having bonuses or extras when getting to that next 10th level would be very rewarding and it'd be cool to know you're the master with that awesome level 100 icon. So basically keep everything for getting level 30 the same, just add bonuses for further levels, Maybe you'd have to win 3 games in a row to get from say, 50-51. or 49-50.