Be careful with an ATO spend at that level, if that is a monthly payment amount then you run a real risk of losing this card as it is pushing close to the level where some have already had theirs cancelled... around the 200k level and you will be noticed, especially if there is not a "mixture" of normal spend on that card also. Remember this is a mum's & dad's card, so a ~200k spend per annum won't be the norm with them...
If you are not worried about losing it though, then just use it while you can
I've been running $10k or so per month of ATO through the card for a long time without issues, mixed in with lots of other spend, and no issues so far.
That said, I have been taking a few more "risks" and upping the monthly amounts a bit recently as I'm planning on canning the card soon anyway... I'd prefer to close it on my own terms rather than have it taken off me, but if they do, c'est la vie!