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It's only that price on one exchange. Is that even real volume? Upbit and Bittrex still showing much higher prices.

It was the price on Coinmarketcap, it should consider all exchanges...
I have seen that the price communicated by witnesses differs from that on exchanges. The internal market seems to be biased.

Well some of the exchanges don't have working wallets, so I would argue the internal price feeds used on steemit might actually be more accurate.