I think that the issue of paying at $30 voucher to only some crew would have been seen as discriminatory. After all, we are an Australian airline and we expect the Thais & Japanese to speak english onboard so why should they miss out on what the other bases get. (Before anyone fires off, I know the BKK base is an Adecco base, not a subsidiary, but I think that's beside the point).
For interest - the LHR base did not get vouchers as they had a subsidised Xmas party. Whether you wanted or were able to go is another issue
