Chickenhouse,
I am very surprised you get your hourly rate so low on only 120 hours pa, maybe where you are things are cheaper than the UK.
I was told many years ago that financially the break even point is 300 hours pa and I would say that on a like for like basis that is pretty accurate, start operating LAA types and you can then bring the costs down, especially if you can operate out of a farm strip. You do also need to factor in convenience and availability as well though and only the individual can work out how much that is worth to them.