As far as the student knows, the instruction being given is standard quality because the instructor is certificated and wouldn't be teaching if he or she was not qualified. Only after experiencing more than one instructor, or observing several instructors at work, does the student have a basis of comparison. Money Driven Another source of bad instruction is the instructor who is money driven. This individual cares not for the welfare of his students. He's just interested in the money.
Flight instruction is just like any other service business in that respect.
If an individual enters the business of flight instruction with the idea that he'll get rich, he'll go broke in a hurry. But if he starts out with the concept that he'll knock himself out to serve his clientele, by inadvertence he'll make a decent living. I have operated a flight school for a great many years on an airport where a huge amount of training goes on. Both the ones who cut rates and the ones who were in it for the money fell by the wayside, but while they were operating they did damage to the good operators who are doing all they can to help their students along. Rewards I enjoy teaching.