Im glad that you agree that i'll make a fine pilot jaba i can barely wipe the smirk off my face !
For the record when i work for my self my average margin is $356 per hour buying renovating and selling real estate. Im yet to go broke.
What i'm really getting at is weather or not it is legally and ethically permissible to make a substantial margin under the guise of " landing and Air Services Australia fees " I am not silly enough to totally discount your rationale in saying that it costs to invoice hold money send money etc.
In real estate for instance when you pay a convaencer to hold funds for taxes, stamp duties ,rates etc they do so in a trust account that does not pay intrest to them they itemise your account accordingly they are accountable and even liable for what they do.
This is what the world has agreed as being BEST PRACTICE the question is is the scenareo i have presented this evening what you call best practice ????