Continuously this pair is at very high at daily poloniex trading?
it is not continuously and it never is with the altcoins. it is only mostly in past week that the pump has started and it is not just this coin, it is literary every altcoin that has ever been created and still has a functioning blockchain.each of them are getting pumped for a couple of days to a week tops and each of them will get dumped big at first then go down to normal price slowly.
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Why volume is so high?
because it is getting pumped!when they pump an altcoin, everyone starts joining in the pump (most traders have automatic market watch to find these
) and then everyone buys until they reach the top and dump it for profit and leave the bagholders to play with each other. 
