Price difference between vaultoro and wold spot

On Vaultoro the price is showing $ 38.02 per gram and on Kitco the price would be $ 41.70 per gram roughly. 

Can you explain this discrepancy?

The price quoted is all real-time from the Vaultoro bitcoin gold market place.
Vaultoro is a free market, if someone sells their gold under world spot price then the buyer was lucky and the seller really needed to sell. This is a true free market.

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