I don't think you need to be afraid if only you invest your spare money the mony you can afford to loose without causing you discomfort in any part of you financial, and family life. Bitcoin has rise above expectations in 2017 and bitcoin still has the potential to do more in this year 2018 but we should not also forget the fact that bitcoin price is always volatile and at that it can not keep going up always it will get to a point when the price will still drop down.