I'm guessing the order has a sizeable endowment. There's little evidence in the films that Jedi have much in in the way of possessions beyond cloak and lightsaber, though they certainly don't seem particularly morally adverse to owning things in any Star Wars media I can think of.
And why should they care about wealth? There doesn't seem to be any such thing as Jedi retirement, the order seems to handle housing, food, and transportation, and I feel like they probably get to charge anything else they need to some sort of expense account (in a cantina or what have you they'll just sort of order what they want without checking prices... must be nice). A Jedi who radically rejects ownership or a Jedi lured to the dark side by the desire for possessions both seem like solid plot or character points but they don't seem to get explored.
The Star Wars universe seems to have a lot of loose conceptions of property. Droids sometimes seem to belong to the nearest friendly human, and Luke just sort of treated his rebellion issue X-Wing as his personal car. I don't think it amounts to much beyond the fact that narrative convenience and emulating ancient epic usually trump careful world-building of economic or logistical matters. Money exists in Star Wars movies when it furthers a plot or character point, and it doesn't when it doesn't.