Hello Elusion,
No you dont have more money when you level up. Leveling up will just increase your score in ''TAB'' for 1+. You also have to pay in order to level up. Each Leveling up will need different ammount of gameplay hours and they will cost more and more money.
EDIT:
1.) To see whats your level press ''TAB'' im sure you know about it already.
2.) To see how much hours you need to have untill next leveling up type /levelup (this command also works if you want to level up but im sure you know about it already).