It could also be that paying for the course means that you are likely to perhaps be a little older, be more focussed, less likely to be out on the razz as opposed to being paid to learn to get the ratings.
And I don't mean that folk at the college are not focussed, just that if you are paying to live AND forking out large sums of cash too, it must surely add an extra dimension and strengthen resolve to avoid the pub most of the time!
Just a thought
louby