Personally, it's been my experience that buying is the easy(ier)part. It's the selling part (in 2007 unloading all his equities) which I believed you were questioning him on.
I know of many people who sold their entire 401(k)s etc., on the capitulation day back then....as opposed to the top in '07 (where the lucky or very smart sold).
Market Data 
Markets 
AI
