Speaking of billionaire heroes: U.K. loan site Buddy Loans has employed scientific research (Wikipedia, Marvel.com, etc.) to arrive at a rundown of "The World's Richest Superheroes" ... which also includes villains. But never mind that: It's actually a pretty fun chart that's topped by not Bruce Wayne or Lex Luthor, but rather by Black Panther, whose estimated worth of $500 billion -- billion -- leaves everyone else in his dust.
As king of Wakanda (not "Wakanada") T'Challa controls the world's supply of Vibranium, which accounts for most of his wealth. By contrast, fellow head of state Victor Von Doom possesses only about $35 billion; on the plus side, he also has his own time machine and robot army, so maybe it all evens out.
Bow before Doom's entry below, and see the rest at Buddy Loans.