This deficit appears to have been corrected in the Silver Age. Alan Scott was replaced by the Green Lantern Corps, and all the Green Lanterns from Hal Jordan forward have been working class. (Not sure what Guy Gardner does, but Hal was in the Air Force and Kyle Rainer was I think unemployed.) Perhaps sidekicks were used as a counterweight to fix this perceived problem. Jimmy Olsen was given a greater role in Superman comics, and Robin the Boy Wonder figured prominently into Silver-Age Batman comics.
Guy Gardner was first a college football player, then a lawyer, then he worked with physically challenged children until the time of his coma. Afterwards, he was just a hero until he gained the Vuldarian powers and he became a bartender and owner of a succesful chain of bar and grills called Warrior's
As matter of fact, Guy has actually employed other heroes and some villians to act as waiters, waitressess, and bouncers for Warrior's.
Kyle Rayner was unemployed until he succesfully sold some of his artwork to a museum. He then got a job being a comic book artist until his assistant got beaten nearly to death.
John Stewart is an architect.
The pre-Crisis Supergirl went from reporter to student counclier to soap opera star.
Speaking of Swamp Thing, there are many, many magical characters in the DCU. Magic is something that the very lower classes believe in or practice, while the upper classes either dismiss it or campaign against it...and Swamp Thing is himself homeless. If you are looking for working-class characters, the magical sector will probably provide a gold mine, starting with The Spirit.
Mark Merlin a detective of the occult is another