Interesting numbers thanks CJ. The robbo's do get extremely expensive with spiking maintenance cost when the annual hours get below 183. I bet many private owners would not even get to 100/yr.
However I also think you have got lucky with a really nice 500C to keep your maintenance costs down at the level you are seeing.
It is a similarly interesting exercise to compare an R22 to an H269 for exactly the same reasons.
Cheers,
JohnO