... If you're not living in the US, or at the very least there in person to apply for that first card, I imagine your chances starting off would be near zero, unfortunately.
I think that sums it up pretty well. These USA cc offers are not realistic for probably 99% of us, unfortunately. The average non-US citizen/resident has next to no hope.
Good for those who have already got some benefit through previous/current residency, etc. However, it seems to be almost impossible to open a US bank account let alone cashing in on cc deals from Australia.