With the current salary structure for secondary teacher..yes but depends on location.

If exp >6yrs + achieving KPI every year then yes. Higher if in WP or rural area.

Go home..you are drunk.

Air tech makes sure the plane is airworthy not being security guard. 9/11 is not because of failure of plane but terrorists la...

Though i understand what you want to say. Still, its not a good comparison saying doctor's mistake will only cost a life while tech cost many lives.

Your 1st job? I think its quite ok considering its back office.
What you need to do is to manage your expense. Proceed to finance thread and ask for advice.
Then you need to work smart and hard to climb your way up.