As the time goes by, expect BTC and ETH to be MUCH less volatile. This 2018 will see a much more linear movement, as some financial products tied to the price start to work in the financial industry. Not saying it will be as boring as gold this last years, but definitely the $500 up or down days are likely over. And with Bitcoin at $25,000 , a small jump of a couple hundreds will not trigger your margin call ^_^