I know you're having a joke wessex, but that is one of the stupidest comments I have ever read. As Halas said they don't even stop here but overfly Dubai. Secondly also as Halas said, all airlines are allowed, and more to the point welcomed with open arms here. Some stop in Dubai, mainly because of the extremely cheap avgas on offer.
I don't think Qantas would want to stop in Dubai and have identical route segments to Emirates and then maybe they would have to match Emirates, and they are along way behind being able to do that.
On the tax question. My advice from the ATO is that there is no tax agreement between the UAE and Australia, and just as you can't extradite someone from a country without an extradition agreement, the ATO cannot find out from the UAE government what you have been getting paid. Also was told that if you make your transfers home less than $10,000 Australian they are not flagged by the ATO for investigation.