Really? It has already been said that ackies are found in area that do have high humidity similar to western Sydney. I would doubt that people keeping this locality of ackie would be keeping it any different to other localities. Do people that have a vic locality of Lacie keep them different to a North Queensland locality? Keep googling mate....
I'm not questioning the possibility of “animal X living in environment Y”, I'm questioning your logic. You seem to think that because something is theoretically possible, that it's fact; that's not how the real world works.
You can’t make a determination based on a single factor such as humidity. To do this would discredit Darwin’s theory of evolution, all current theories on ecology and generally disprove science in general. You can certainly discuss the idea, but to suggest it as certain is misleading and false.