Level 0 = 1 in 1 (kind of) 						AVERAGE
Level 1 = 1 in 100 (*100)						BETTER THAN 99% OF THE POPULATION
Level 2 = 1 in 1,000 (*10)					BETTER THAN 99.9% OF THE POPULATION
Level 3 = 1 in 100,000 (*100)					BETTER THAN 99.999% OF THE POPULATION
Level 4 = 1 in 1,000,000 (*10)   				BETTER THAN 99.9999% OF THE POPULATION
Level 5 = 1 in 100,000,000 (*100)				BETTER THAN 99.999999% OF THE POPULATION
Level 6 = 1 in 1,000,000,000 (*10)				BETTER THAN 99.9999999% OF THE POPULATION
Level 7 = 1 in 100,000,000,000 (*100)			BETTER THAN 99.999999999% OF THE POPULATION
Level 8 = 1 in 1,000,000,000,000 (*10)			BETTER THAN 99.9999999999% OF THE POPULATION
Level 9 = 1 in 100,000,000,000,000 (*100)		BETTER THAN 99.999999999999% OF THE POPULATION
Level 10 = 1 in 1,000,000,000,000,000 (*10)		BETTER THAN 99.9999999999999% OF THE POPULATION

It gets less and less worth it to level up as you go.

EDIT: If this proves anything it's that [@Medjedovic] shouldn't leave us on our own for too long