Unfazed - missed the humour, no worries!
Why put the overheads on the FI charges ?
Obviously a school is trying to earn a living and there should be some profit, especially if you are not using a club aircraft where you would normally earn it. However, double the instructor fee is as you rightly say, extracting the wee.
I know at my school we pay quite well and that tends to keep your instructor with you, unless an airline job arrives. But this is clearly no surprise to us and we wish them well when they go - well done!
But it is a hard industry to earn your keep and instructor wages suffer undoubtedly. This is not always the schools fault but more of the high costs generally involved, and i can honestly say that loads of profit is not creamed off to the CFI/owner here!
KK