Bradman's bat underpriced?

The suggestion in this article about the auctioning of Bradman's bats is that a bat he used in 1930 Ashes series signed by him on one side and the rest of the England and Australia players on the other, will only go for 30k Australian Dollars (less than £19k). That seems crazily low for me given the number of insanely rich followers of cricket there are out there.

Surely it will go for 6 figures?