Just wondering because buying BTC when it was next to nothing or less than a dollar and then seeing it grow to like $100-$500 and more, I have a feeling that they would have sold a significant part of their hodlings to cash out on the profit over the years.
Very likely they also did spend some of their Bitcoin holding especially when the value significantly soared to the sky. This is just human nature especially with the fact that there is no guarantee what the future may hold and nobody can predict what can be. We are seeing a good Bitcoin right now but back then the coin experienced many ups and downs which can send some cold sweat to anyone who is not having a gambling mentality.
Still, at the current rate, you don't need that many Bitcoin to be considered as rich because of cryptocurrency. Just 150 Bitcoin can already induct someone into the millionaire table and soon when it will rise further just 100 pieces is enough to be in the middle class (at my country's standard).