@jamescowens tracked down the code and found that a magnitude+balance poll figures weight with the following equation:

vote-weight = ((Magnitude * (MoneySupply/TotalNetworkMagnitude + 0.01)/5.67) + Balance)

assuming that money supply = 400,000,000 we get:

1 mag = ~613 vote-weight.

This increases almost linearly with the increase in money supply.

I have added this to the post.

self-upvoted for visibility