@Christel
i believe that salary in australia is much higher than that of dubai, as mentioned by @admin, you can check the salary guide given, and another thing, salary varies in locations, regional is lower than that in a city due mainly i believe to cost of living...and another thing in australia you'll have the change to live permanently and eventually become a citizen...many here i believe will agree to that...
you don't necessarily need an agency if you want to try your luck in australia..if you have the skills and experiences you can apply directly to some companies who actually sponsored people into coming to australia on a working visa