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That raises an interesting question. Mine is supposedly 0.12 SBD but what is that in USD really?

I think the formula goes like this:
Vote value in USD = (Value in $ / 2) + (Value in $ / 2)*SBD price in USD

So at the moment 1 $ = 0.5 + 0.5*7. = 4 USD.
Correct me if I am wrong.

From this value you have to deduct curation by the way.