The FT runs a magazine called "How To Spend It" with ideas for what cheeky stylish thing to buy this month after you already spent it on what you want to. That this is apparently a lucrative business possibly tells you that you can max out your quality of life and still have money leftover.
Really depends, I can see a lot of quality of life on leaving family set for the next few centuries. And a lot of headache on managing the next personal island.