Being a super-hero is expensive. It's expensive mentally, physically, and financially. It takes an immense physical toll on the individual who chooses to become one, and depending on the type of hero they are as well as how they operate, it can take a huge toll on their wallet as well. That is why Batman is such a successful hero. He's a rich playboy, who when being Bruce Wayne, gets to enjoy whatever joyfully morsel life has to offer, but also has the technology and money to hide his Batman persona.
But Bruce Wayne is not the only rich man in the super-hero community. Sure he's one of the most famous, but not the only one. There are plenty of heroes, in both the DC and Marvel universe, with more than enough cash to throw around at their super-hero careers. Some took a step farther and invested everything into their careers. Others only use the money to keep themselves afloat a sea of stress. Which is quite understandable.
10 Oliver Queen/Green Arrow
The hero of Star City himself, Oliver Queen is the owner of Queen Industry and a billionaire. He uses a subsidiary called Q-Core as a base of operations in Seattle. Much like Bruce Wayne, he inherited the company from his father. But unlike Bruce, he also works at the company more often than people give him credit for.
He's been directly involved in mergers and purchases, making him a well-recognized businessman. While Wayne is more famous for being a playboy and philanthropist.
9 Danny Rand/Iron Fist
Co-owner of the Rand Corporation, Danny Rand is a millionaire/billionaire, who not only owns a majority share of his company, but he is also the CEO of said company. Though he inherited the title, he doesn't participate as much in daily duties. He has underlings who gladly do the work for him, while he goes off fighting crime as the Iron Fist.
Much Oliver Queen, Danny Rand also ended in a distant land after an accident where they both trained to become their hero personas; Queen on an island, Rand in the Mystical K'un-Lun.
8 Tony Stark/Iron Man
Made exponentially more famous than anybody on this list thanks to the MCU, Tony Stark the Iron Man is as many already know, "Genius, billionaire, playboy, philanthropist." He inherited his father's weapons manufacturing company, Stark Industry, and took it even farther as its owner, lead inventor, and CEO.
Before making it public, the first few issues of Iron man had the character try to maintain a secret identity. His rich flamboyancy is obviously too much to keep secret, as many fans know.
7 Michael Holt/Mr. Terrific
Most likely the smartest man on this list, Michael Holt is the lesser-known but still extremely wealthy, Mr. Terrific. He's likely the smartest entry on this list because that's basically his super-power. He has a natural aptitude for having "natural aptitudes."
He's a genius inventor with 14 Ph.D.'s, a self-made millionaire, a surgeon, a high-tech Cyberwear firm he sold to Waynetech, and a gold medal Olympic athlete. He's also the third smartest person on the planet in DC comics.
6 Reed Richards/Mr. Fantastic
The Father figure of the Fantastic Four's family, Reed Richard's a genius inventor/scientist, with the ability to stretch his body to extreme lengths. Although, few people realize that he's also very very rich.
He's made his fortune selling the patents of his inventions, and renting out his services to either government contracts or universities and companies; plus he owns his own building. Mr. Fantastic just doesn't care about money. He's more interested in the scientific-phenomena than wealth and riches. A noble trait, for a noble genius.
5 Adrien Veidt/Ozymandias
The former Watchmen member and destroyer of New York City is, as many know or expect, extremely rich. His character is a satire of the philanthropist playboy/genius millionaire in comics, who becomes a super-hero. He was loosely inspired by Lex Luthor but is mostly an amalgamation of different super-hero traits/tropes.
He is, ridiculously wealthy since he was able to invest billions in tachyon research just so that he could blur and distract Dr. Manhatan's ability to see his future. That takes commitment and a lot of cash.
4 Charles Xavier/Professor X.
Another character most fans don't realize is loaded, Charles Xavier, the founder of the X-Men, is fairly wealthy. He's a leading expert in genetics, a genius scientist, and rich He inherited a great amount of wealth from his family which he then invested to make an even larger profit, and has received generous donations from several wealthy mutants for the development and advancement of his school.
The mutant Fatomex, when trying to extort Xavier, calculated he is worth around 3.5 billion. That's a significant amount of money for a school-teacher.
3 Ted Kord/Blue Beetle
Genius inventor, strategist, and crime fighter, Ted Kord is the first iteration of the Blue Beetle. He invented all his gadgets, some of which he sold for millions, sold his company to Wayne Enterprises, and then invested the rest of his time making inventions to help him as the Blue Beetle.
He's less known than other superheroes, especially after the mantle of the Blue Beetle was taken by the younger Jaime Reyes, but he still deserves his place on this list.
2 T'Challa/Black Panther
The king of Wakanda himself, the wealth T'Challa has is absurd. Wakanda is the sole source of Vibranium, one of the rarest and most versatile metals in the world. Because the nation kept itself closed off to the world for centuries, they were able to monopolize the sale and mining of the almost indestructible metal.
Not to mention, Wakanda is a technologically, and socially advanced nation, that is still a Monarchy. T'Challa has access to an almost indispensable amount of wealth, which he modestly uses to better the world when he can.
1 Arthur Curry/Aquaman & Namor
These two need to share the space, not only because they are both reflections of each other, but because of how ridiculously rich they both are. Arthur Curry, the Aquaman, and Namor, the Sub-Mariner, are both kings of their own version of Atlantis.
They both have a claim to all the treasures lost at sea, and both already rule a technologically advanced underwater society. Aquaman is slightly wealthier than Namor, but the Sub-Mariner is CEO of his own company, which has a net worth of 260 billion dollars already.