I am not sure what you mean. Everyone knows that occupation ceilings are not in line with the actual supply of skills or the number of invitations. The system is flooded with applications from a handful of occupations. These occupations always hit the ceiling and a large portion of applicants don't even stand a chance. Meanwhile, the majority of occupations don't come anywhere near the ceiling, some reaching no more than a few % of the set quota by the end of financial year.
Points-based migration system is a good thing since it is always preferable to have educated migrants rather than uneducated ones. However, it seems to me that DIBP is not doing the best job in diversifying the skills of their new residents. For instance, Australia has been infested with Accountants (no offense if you are one of them) for yeeeaaars and I am not sure why they are trying to import even more of them. I guess it is difficult to get rid of old habits, especially if they have proven to be such a reliable cash cow. 8)