Dare I ask what your opinions are of organisations like OATS and CTC then? Essentially you could class their cadets as buying their way in
No, they are not.
Going to OAA or CTC does not mean you are buying a job. CTC is different as you know. Unlike OAA not everyone can go because not everyone passes the selection, hence the people who go through are the ones who fulfil the partner airlines' requests, so CTC is irrelevant.
Sure, when going to OAA you have taken the decision that it will give you an advantage over others (and you are paying for that), much like you may decide when buying a TR or line hours. But the difference is that EVERYONE has to decide where to train whereas NOT EVERYONE chooses to get a TR and line hours. Hence you are buying your way to a job more so than others.