Who knows when the price will be dumped again. There is no assurance to it.
One thing we know for now is that it keeps on going up because of different event that had been happening in social media websites.
Yes, a crash will happen but we cannot see the future so it's a risk one investor should be willing to take.
The result will either be profit or loss. With loss though, you can still wait for another pump to come.
I'm sure the OP speaks like this due to the fact that he knows the history of Bitcoin's price. And we must all agree that there is a correction after each bubble. Unfortunately, he did not include one very important thing. Every time there was a bubble in the Bitcoin price, the bull run was longer. In the present situation, the bull run could easily for next several months or even over a year. So even if there are small corrections during that time, it is still a very good idea to buy Bitcoin for $50k.