I used to work in a flight school environment and saw it first hand, regarding the guys who couldn't pass. Eventually after a good few hours they would get their PPL's a lot of them ended up not making the grade for the CPL exams. Not that I am defending anyone, I have also been a witness to someone who was involved in something fraudulent but nothing ever came of it. A lot can be bought for a price. I have also noticed, in my period there that a few of the guys realise after their PPL's how much work needs to be done and go and work their butts off to pass those exams, so I feel it is really half a dozen of one and six of the other....