Because the initial distribution went to everyone who owned coins on the original chain. This included those who absolutely wanted little to do with Bitcoin Cash and dumped their BCH as soon as they could figure out how. We should start seeing a turn around at some point. Eventually, the supply will  be distributed to the ones who actually believe in the coin away from the ones who don't want it. There will also be plenty of coins that go untouched by people who are too apathetic to even bother learning how to claim their coins.(It would also be beneficial to somehow figure out a way to stabilize the hash rate to mostly devoted miners, other than the BTC.top farm and the mystery miners' farms. Having chain hoppers who have no real interest in accumulating Bitcoin Cash, is not helping the price at all. Let the chain hoppers contribute to the two segwit chains. )