Why do you vote? You vote for 2 reasons:
1) You pay taxes and thus have a right to say how your tax dollars are spent
2) You are held accountable to all laws and thus should have a say on what laws there are and their associated punishments
Corporations pay taxes and are accountable to a variety of laws and punishments yet they have no direct say in how their tax dollars are spent nor any say on the laws concerning them.
A left wing view would say that Corporations pay taxes because the taxes are to pay for the right to act as a company and make money off the people. But that is a very communistic viewpoint. Corporations help our economy along and provide large numbers of jobs and pay for the majority of society's wages. If it was not for Corporations then Australia would be as poor as Communistic regimes such as Cuba and North Korea (ignoring China which has a free market).
So why can't a corporation vote. Currently if a Corporation wants a say on a law then it can attempt to 'buy' a politician. As a society we don't like this, as it can corrupt the politicians vote on other issues and makes normal votes worthless. But if a Corporation could vote then there would be less need to buy a politician.
Corporations play a larger and larger part in the Australian way of life. It may be a bit hard to see here in Canberra with our multitude of Government departments, but out in the 'real' world Corporations are the life blood of communities. Take for instance Young which has two major Corporations - National Engineering and the Young Abattoirs. They employee a large part of the town and contribute greatly to the tax revenue of the town. But they can have no direct say on how to spend this taxes. This is unfair.
How this will be implemented I still have to work out. We need to ensure that people can't make a Corporation with the sole desire to get an extra vote.
Now if this doesn't get comments I don't know what will.