Look its simple, it should not be the concern of the immigration department how much salary one has to keep their wife and kids with them, coz honestly its common sense that if i cant provide for my family i will not bring them here right? But its good to have the option to keep my family here on a long term basis, instead of running about every 6 months to renew/reapply, wait for 3 months before applying again which is just bull crap!