This is a hard thing to decide 10k is quite expensive to buy, but what if it was already been corrected and the price continue to increase until next year? Now, this is purchasing Bitcoin in a much risky situation than before coz we're dealing a huge amount of capital, thats what will always come to our mind first. But if you have to take a deep thinking about it, it makes no difference when you buy a much cheapear price before or buy in an expensive price today, because the point is to gain profit and multiply your investment. The only thing is, those people who invested 3-5 years ago has made a big edge from those who invested today. To sum it up, it will never be too late to buy Bitcoin, because the price will always increase until the last piece is mined.