My question was actually prompted because I am sorting out a cupboard (been putting it off for ages) and found lots of old 'photos. I echo what is said above. One of my happiest times was at university when I was skint - but we all were, so it didn't matter.
Then I found 'photos of my wedding day and my children when they were babies (they are now teenagers) and we all look so happy.
I was a partner in a large law firm for many years. At first that was happy too, but I became progressively more miserable until in the end it felt as though I was working at Mc Donalds - ok, we processed files instead of burgers but it was the same sort of environment. I did earn a lot of money but I wasted a lot of it on things I didn't need - to try to cheer myself up, but it didn't really work. I developed high blood pressure and depression.
I now work as an independent consultant and have total flexibility and often work from home. I am blissfully happy, spend lots of time with my DDs - we often go out for lunch or to the theatre for a matinee, sometimes bowling. My blood pressure is back to normal, my depression cleared as soon as I left. I don't earn as much (still into six figures, since someone asked - for some reason, someone always wants to know the specifics).
My conclusion is that it is a law of diminishing returns - once you have what you want/need at a certain level, it is counterproductive to earn any more.
My needs/wants? Apart from health, family and friends - my dogs, my radio, books, theatre, countryside, town, food, and a good bottle of wine (oh and somewhere to live of course!).