Why did Fan Li become a businessman?

After helping Gou Jian, the King of Yue, wash away the shame of Wu, he resolutely retired and became a big businessman under a pseudonym.

Fan Li (536 BC-448 BC) was born in Wandi (now Taohe Township, Xichuan County, Henan Province) in the Spring and Autumn Period, and was a Huaxia nationality. A famous politician, strategist, economist and Taoist scholar at the end of the Spring and Autumn Period. He made suggestions to help Gou Jian, the King of Yue, restore the country, and then disappeared. He is the author of two articles, Fan Li, both of which are very bad now.