So, someone stumps up $120k in the expectation of a job with QF.
They fail to meet the QF selection. So they stump up another $60k to earn the privilege of teaching the next group, who fully expect to meet the QF selection, having paid their $120k. For their money they have an expectation of highly motivated and skilled instruction.
The USA model is different in that the instructors need to get 1500 hours. Depending on the particular academy, some may not know one way or the other whether they will make it to the big time. Either way, having to do a good job for a couple of years would surely be a better motivator than to employ instructors who already know they have been rejected and are merely hanging in there to pay off a huge debt as best they can.