actually, most game systems work on similar principles.
try any RP system, if it starts out too slow, no one wants to play 0 level pesants for more than 5 minutes. and you'll have a riot on your hands.
start off too high, and your 100 ton battle-mech will start destroying the local cities just for something to fill the time, plot hooks be dammed.
-RuskiFace the Pirate