The problem with this is that its often difficult to tell whether a person is suited for a job or even would like a job until the person starts training in it.

The problem with this is that its often difficult to tell whether a person is suited for a job or even would like a job until the person starts training in it. You could decide you want to go into HVAC because there's a lot of money in it. But six weeks into the training you hate it or you realize you suck at it. Who foots the bill for that failure?