Whirlybird
We are the paying customers; why do so many of us act as though flying schools and instructors are doing us a favour?
People put up with this c**p quite simply because the utterly decrepit GA scene doesn't attract discerning customers.
Most of the people that do turn up to learn to fly are desperate to fly - at least until the novelty wears off. Most of them can't really afford to fly anyway; if they could they would insist on much higher standards.
But if you run a typical flying school, count yourself lucky (in a bizzare sort of way): if all of your customers were discerning, you would end up with almost no students and would go bust as quickly as it takes you to hit your overdraft limit.
If anyone disagrees with this, I would like to hear a reasoned argument.