Market price in some cases are unpredictable because I have heard of some one buying a coin in a certain rate, but just for sometime it get reduce to a lower rate,so market price is unpredictable
If you talk about Bitcoin? Yeah, we can't deny that it's volatile and unpredictable. But that is one of it's trait that we learn to embrace, and others, like traders loves as they can make money and squeeze in a day or two.
But for most of us who DCA or invest in Bitcoin slowly, then we don't care about what the price is, as we buy it using the average. So if you can't take that, then maybe Bitcoin investment is not for you and you can go buy some cheap altcoins and then just wait for it to dump when you are sleeping.