Well I have personally not had a lot of money most of my life so I know what it is like to either not be able to always buy things I want or only get some things. But if I made lots of money, I would donate to charity(maybe directly to research foundations since most charities take off too much from the donation for themselves), I would also help out friends and family too.
I have a feeling a lot of the rich people tend to do that as well, like with natural disasters etc.