When you are wealthy, you automatically hate any changes and everything that might cause those changes. Millionaires want to maintain status quo forever, but, unfortunately for them, that's not how things work in this world. The wisest from them are aware of that, of course, and now actively buying BTC at low price.
Well, that's one of many reasons, Most of the millionaires spend their whole life to keep on making the same or more amount of money so that they don't have to bring low-status lifestyle. This is what I've seen with most of them.
Some are millionaires for their hard work and they reached that height doing a single work and bringing change to that work will lead to re-learn or master another skill to remain at the same height which is not desirable for each and every one of them.