"But I still can not fathom the stupidity of the current tax system that supports leveraged up mum and dad punter landlords over the professionals with economies of scale."
Bigger is not always best or better. If it was then lets get rid of all small businesses - after all bigger is better.
Example: Grocers, butchers etc - get rid of them all. Lets only have the choice of the likes of Coles, Woolies, Aldi etc