Brazil is a very expensive country to live in.
I didn't realise that, so you've got a double whammy then, low wages and high costs.
move to Australia a few times. Once my wife finishes here post-doctorate, we might just accept her offer.
My totally unbiased opinion is that you should, especially in light of the above. Have you looked into whether or not you can immigrate to Oz? Last I heard they wanted plumbers 
Rob