It's useless coins, toys for a short time. Poloniex not add to itself coins like this, so as not to create conflict with the law.
Whats up withPoloniex? Eventually XCI should be exchanged for the Legal Cannabis and should not be associated with any specific exchange. Decentralized exchange channels are preferred. You can trade XCI at Cryptopia with about 10-20 btc 24h volume. Can expect more exchanges soon. Bittrex and Poloniex are familiar with cryptonote coins so it should not be difficult to add XCI there.