There are a number of business men who are totally opposed to AWA's. When they employ staff whose skills are in short supply (ie high demand) then there are always other businesses poaching by offering better Ts & Cs. The result is that they are paying more for their staff then they would have if an award was thrashed out with a Union. With all companies paying "award rates" there is very little poaching.
Pilots are now in the position where we can reject poor terms & conditions because there is a shortage (even in Oz).