In mainstream Marvel Comics, how does Charles Xavier pay for all the gadgets at the X-Mansion? I understand that the mansion itself has been in his family, but the Danger Room, Cerebro, the X-Jet, missile defense systems, and all of the advanced technology must cost and arm and a leg, not to mention the electricity and other materials to power them. And unlike Bruce Wayne over at DC Comics, Xavier doesn't have a company generating revenue to pay for it.
How does Charles Xavier pay for all the gadgets at the X-Mansion? Does one of the mutants have the power to print money?
This question was inspired by Atop the Fourth Wall's review of X-Men #1, which jokingly suggested that Xavier got a Pell Grant for the school to fund missile defense systems.