Not being motivated by scarcity totally exists and is an excellent thing for those who can pull it off, but AFAIK it requires a very unusual type of personality. I would say, almost abiological, since there is not much in our evolutionary past that would be about post-scarcity motivation.

Something I must add to my model: everybody I know who is wealthy had parents who were born poor. Or grandparents. I am born about middle to upper-middle perhaps but still remember grandpa's childhood stories about travelling on the roof of trains. So a perhaps my model is better explained by saying they inherited a certain amount of scarcity mentality and then don't know what to do when it no longer applies. I have no idea what real "old money" is about, when one is 100% secure one cannot lose their status, maybe they more easily get this kind of non-scarcity motivation.