system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Where does Xaviers Institue for gifted youngsters, and its instructors, generate revenue?

Does it charge tuition like other private schools? What about poor mutants that need help? Is it really just a pyramid scheme?
gpt
Professor X's family are known to have been wealthy and he inherited a large sum, as well as the mansion they use as a School. He bankrolled the team for many years but there *have* been periods where comments about the School going bankrupt have been mentioned, so it may be that his wealth is not inexhaustible. 

In the past they have received generous donations from Warren Worthington III (Archangel) who has at points been a Billionaire and various members of the tea, including Rogue and Gambit have been shown to have significant amounts of money, so they may help out too. 

It is likely that Charles has invested well, having somewhat of an advantage in the stock market and so is able to keep them going, but there is outside help which keeps them going if they need a new spaceship or something.