"Money is just a way of keeping score." - attributed to oil baron H. L. Hunt.

One might just as well ask why the person with the largest collection of toasters (https://www.guinnessworldrecords.com/world-records/largest-c...) wants them since there's a limit to how much toast he can consume. Soime people have passions and they work to realize them, whether it's something silly toasters or something crass like as wealth and power.