Comes down to the fact that we are happy to make money from them selling our wares, resources industry got us out of trouble post GFC, interest rates and a high dollar punished our manufacturing and now we need to reciprocate as their purchasing power is essential to survival.
Trade off - real estate and a haven for the wealthy Chinese elite. Heck , looking at the shape of the world I would happily pay a premium for real estate in Australia no matter where I come from to be able to enjoy the peace and the very best prospects of stability. The worst that happens here is that we loose the Bledisloe Cup to our neighbours. Absolute tragedy.