Over eons of evolution humans have learned that they will survive longer and better if they conserve their energy. We’ve learned that we want to spend enough energy to have enough resources (food, water, sex, shelter), but beyond that we are wasting our energy if we spend too much time running around getting stuff.

https://www.blog.theteamw.com/2010/06/28/100-things-you-should-know-about-people-36-people-are-inherently-lazy/