Many people around the world would say the same thing about the lifestyle enjoyed by the average commenter on this forum, but most of us don't think of our incomes that way. The average American does not need to live in the home size that has become desirable; they do it because they can.
You can't set an arbitrary limit on when money ceases to be motivating. At $100M in net worth, you no longer need to compromise on a lot of things that people with a $1M net worth have to. But at a $1M net worth, you also do not have to compromise on a lot of things that people with a $100k net worth have to, and so on and so forth.
If I had a net worth of over $100M, I'd probably still do things that increase it. That doesn't seem any more inherently greedy than my seeking to increase my net worth now, when it's orders of magnitude lower. I'd do it because it's what I know to do, and because more resources is rationally better than fewer resources.
You can't set an arbitrary limit on when money ceases to be motivating. At $100M in net worth, you no longer need to compromise on a lot of things that people with a $1M net worth have to. But at a $1M net worth, you also do not have to compromise on a lot of things that people with a $100k net worth have to, and so on and so forth.
If I had a net worth of over $100M, I'd probably still do things that increase it. That doesn't seem any more inherently greedy than my seeking to increase my net worth now, when it's orders of magnitude lower. I'd do it because it's what I know to do, and because more resources is rationally better than fewer resources.