Some would see it as no different, but I can see it from QF's point of view.
"""You are buying points, ie getting a benefit from points obtained outside of QF's purview, out of QF's control, and none of the $ paid, if it was exchanged directly goes to QF"", granted the original obtainer of those points would have flown QF or got their points by QFmall or QF hotels, or QF chauffeur, or what so ever...
Probably some would see it as not illegal, and I am not a lawyer, so can't say for sure, but if something prevents me directly earning from it, (if I was the business) and that there is a benefit gained, I would also be not too pleased.
Airlines can take action, ultimately shutting down accounts of culprits, but others, we sue, don't we?
Don't know what the outcome of the OP will be, though.
Would "oh, I didn't know" really be a good excuse?
Like not knowing that the buying and selling of lounge passes, *until lately when it became all electronic, meaning QF has/have a trail*... is frowned upon of course.