Well like you said it something that a history of success and that's a risk me myself and most other investor are willing to take. Buying Bitcoin is something that holds great benefit even though it's a slow process but thats because something that is good is always worth waiting patiently for it.  There are so many people who still doubt the success of Bitcoin especially about the uncertainty of it future but we all know that it holds great future so it's better taking the risk of buying and holding on that Bitcoin in regards and hope that it's past history has already shown us that no matter the ups and downs all fingers are pointing that it will definitely increase in value and worth so stacking up either through DCA method or Lum sum method either way that suits the investor just have the mentality that HODLing of your Bitcoin is the main goal for now.