A simply answer is that you can earn different salaries depending on where you are prepared to go, how long a contract you want & more importantlly what types & experience you have got. By your initial post I have the impreession that you have no
expreience or direction in which way you want your carrer to go, its all about money.
You Have to make your own choice maint or design, when you do it will be what you are best