They stated in their government submission they want more money in the bank is case they get sued (as well as the risk of cyber attacks), the only chance of a lawsuit of that size would be over direct registrations but it would bankrupt them anyway if they lost a class action.
I absolutely believe that is the real reason, they still want to run the registry. AUDA running the registry would be a disaster for consumers in my view in terms of higher cost. It is just empire building by AUDA, they want to say they took AUDA from X to 2X, 3X. I think they want $50 million - $100 million in the bank.
For the moment the next best thing to running the registry is taking most of the profitability by not passing on the price discount fully to Australian consumers.
Even in the CEO's SGM presentation he referenced running EBERO's (emergency banned registries for other tlds). AUDA has the same issue as Nominet, they think they need to make more money all the time when they are actually a not for profit.