refer to post #6 by Torres - he explains why they keep leaving
VH-XXX, what Torres said is only part of the story. What many "organisations" don't understand is that
they are a large part of the problem and the reason Torres gives are only the excuse given and not the only reason. Most people tend to avoid conflict and not say that they are being treated badly to the individual responsible.
I know of several cases in the last couple of years where GA operators lost their apprentices because they treated the apprentice with disdain and refused to invest in their training. The apprentice told the operator the "job is not for them" but told others the real reason. Then the operators would say when asked why the apprentice left, that they were "useless" or "unsuited" to aviation. It's like anything else you invest in, take care of them and they will earn you money. Treat them badly, you'll lose them, whether the investment be aircraft, tools or apprentices and tradesmen.
It's time many companies face reality, they are often the problem. Sorry if I've sugar coated it!