Many people mined enough for a masternode (or several masternodes) long before Solaris even had them, so the original cost was just for electricity and that was paid back long ago.  Then other people that may have bought near the peak price don't want to take a big loss by selling now; it's better to wait for the exchange to launch and the coin to go up once people realize they can get double benefits from a XLR Masternode at that point.