1. George Harrison (Beatles) was instrumental in getting Monty Pythons "Life of Brian" filmed, when everyone else was so horrified by the idea of religious irreverence that they refused to pony up any cash. Harrison said simply "I want to see the film" and mortgaged one of his homes.
2. Edward G. Robinson (american film actor, "Key Largo", etc.) bought several of Frida Kahlo's paintings. Everyone else at the time thought her work was just weird.
I think one common element here is that creative people tend to understand it when other people are creative, and often are moved to act to free up that creativity.