Since the introduction of the official pools prices droped even crazier then before. My theory is that before official pools only a few people got XCH and most of them HOLDed their XCH because they were aware this is a long term investment. Due to official pools now everyone is getting XCH frequently. The majority of (medium) farmers took debt to invest into hardware and is desperate to sell any XCH they get to pay they bills. Hence, the drop of XCH to now 160 US-Dollar.