using an agent is not illegal. In Thailand it is just business. If the authorities decided it was illegal to use an agent, then they would have to prosecute half of the expats living here. However, make your own mind up and do what you are comfortable with.
Nobody was talking about taxes until you raised it! The subject was about how unfair Australia was making it for their citizens to retire overseas by making them live there for two years to qualify for something they are entitled to! It's typical for someone to divert the point of a debate to point out an unrelated matter rather than admit the injustice!
I stand by my comments that Australia is cheating it's citizens of what they are entitled to! Even though you were not born in Australia, it seems that you have been indoctrinated to not be able to bring yourself to admit that Australia is not the utopia that it once was!