As each skill level takes over five times longer than the previous (a geometric progression) while the bonus it provides almost always scales linearly (e.g. 5% bonus to something per level, with level 3 providing a 15% bonus, etc.), a new player has the option to either acquire acceptable skills in many fields, or perfect skills in a relative few.
Emotional Arithmetic | Arithmetic | Arithmetic mean | Marathon world record progression | Modular arithmetic | Robinson arithmetic | Reading, Writing, and Arithmetic | Fixed-point arithmetic | Dirichlet's theorem on arithmetic progressions | arithmetic mean | Arithmetic for Parents | World record progression 50 metres breaststroke | World record progression 200 metres individual medley | World record progression 200 metres backstroke | Women's shot put world record progression | Women's pole vault world record progression | Women's 400 metres world record progression | Time Change... A Natural Progression | reading, writing, and arithmetic | Raphael Robinson's Arithmetic | Progression of British football transfer fee record | Mile run world record progression | Men's hammer throw world record progression | Glossary of arithmetic and Diophantine geometry | Chord progression | chord progression | Arithmetic (song) | Arithmetic progression | Arithmetic function |