I don't know what bitcoinaverage has to earn from this but as a stats providing website accuracy should be something importand to them.
We don't earn anything from ignoring an exchange, in fact we earn next to nothing by maintaining this service
As Newar has kindly quoted out comments on this already, there isn't much i can add. We would welcome a solution to this problem, and of course the code is open source so anyone willing can email us with a discussion on implementing something