Why don't the parent privatise SIE? It makes no sense to...

Why don't the parent privatise SIE? It makes no sense to maintain SIE as a listed entity as the cost of ASX listing fees and related cost are substantial.

The Appendix 4C - quarterly has some interesting costs such as Advertising & Marketing any expenditure above 10% of sales is usually excessive. The products SIE sells are pharmaceuticals with advertising and marketing limited to doctors and hospitals usually by law in many countries. The products are not consumer of food products that high levels of TV and related promotion.
It would be interesting to know how this money is being expended! It could be SIE is rebating the parent for advertising and marketing material There should be higher levels of profit as expenditure seems to be excessive.