When you have enough security that you have no worries for the medium term, you gain the luxury of time and brain energy to contemplate these things rather than having to focus your thoughts on such base things as eating, shelter, health, and maintaining your position.
The majority of us focus on our jobs, buy gadgets and take vacations because we don't have the luxuries of time and peace of mind (since our focus is by necessity on the near term), but we'd like to have them. And even a short-term feeling of luxury is better than none.