In 1994, Bill Gates bought the Codex Leicester, one of the notebooks left by Leonardo da Vinci. The price? $30.8 million. Gates explained that he bought it because he has always been amazed by Leonardo and how he worked out so much science on his own and understood things that other scientists didn't at the time.
When Windows Vista was launched, the British Library launched a website that let people browse through virtual versions of two Leonardo da Vinci notebooks. One of them was the one that Gates bought.
Seems like a good use of your personal wealth to make humanity better and promote your products at the same time!