Plain and simple
CTC has a lot of overheads and almost certainly long term loans it needs to service every month like most businesses. They are in the business of training. If they ain't constatnly trainig, then they ain't constantly bringing in revenue.
New revenue=new blood
rack em and stack em!
some will get jobs, some won't
plus, not everybody will be the right profile airlines are looking for so there will always be some non-utilised/spare capacity labour kicking about
it's like the Premiership - there are lot more folk that want to play in it, try to play in it and think they can play in it, than actually will