Their no time you purchase a bitcoin that's expensive, what I really want you to understand concerning bitcoin is that the price will continue to increase, so therefore the price of bitcoin increase and when you purchase as the price increased their is every tendency that the price may increase more than what it was before, so that's while I said that theirs no time you purchase a bitcoin that the price never be expensive from my understanding of cryptocurrency,  so therefore bitcoin price should not make you not to purchase more of bitcoin,  because two things are involved into cryptocurrency investment especially bitcoin, neither you lose in your investment or you gain in your investment.