It doesn't really help to compare to overseas either. In America some clinics routinely transfer 3 or 4 embryos (usually just for older patients, but sometimes for younger ones). You won't get that in Australia. As already mentioned above, you will generally only get a Dr to agree to 2 if you are older or have a history of failed transfers.

We started transferring 2 embryos after our first two (single) transfers were BFN. I was also a poor responder to the meds (which we now know was probably due to my low AMH level). We were always given the same chance of success, regardless of whether it was a single or double embryo transfer.