LogFAQs > #979629992

It's never even really explained what Bruce Wayne's company does, he just has a company that's so profitable he can fund the Justice League's worldwide/intergalactic operations with (fully staffed) space stations, orbital weapons, intergalactic spacecraft, and teleportation.

Because "Bruce Wayne" is basically an irrelevant part of Batman's character in most stories, it's just an excuse to explain where his infinite resources come from and that he's Batman because his parents got shot.

Now, Tony Stark on the other hand, stopped selling weapons and makes a lot of new tech he doesn't sell, so in theory he should run out of money eventually if he keeps mass producing Iron Man suits and Avengers buildings, but he just doesn't.