So he bought Prius for 1000 Bitcoins years ago, that is a whole lot of money now. Well he never knew Bitcoin will get to its current height as of today so he had to use his money to get what he wanted as of that time. So many cases are seen in so many places, people who sold their bitcoin before the bull run.
Who wouldn't know what will bitcoin capable of in the future and at that moment few people don't trust investing on bitcoin since only few people are using it unlike today million of people are using it and still counting. At that moment when he bought a prius using his bitcoin he is already satisfied on what the value it is.