User blog comment:SforHope/The Most Annoying "Ruining" Gag in Batman/@comment-1639863-20141204022203

It makes sense, though, based on the character. Batman is appealing because of his struggle. He's a normal man who suffered the great loss of his parents at a young age and went on to become amazing. He's a dark character. That's what makes him appealing. To give him a stable relationship would put him out of his element. It would give him reason to be happy. The feeling of loss would be overshadowed.

A common theme with Batman is that no matter how alone you feel, you always have friends to back you up. Alfred, Robin, Nightwing. If Batman had a babe on the side to go home to every night, he wouldn't feel alone. He wouldn't be able to relate as well on an emotional level.

Superman, on the other hand, easily married Lois Lane. He's the man who has everything. An American dream. Batman is much darker than that. Therefore, he can't find comfort. He can't forget his pain with a stable relationship. He needs to have some drama to spawn that emotion from the readers. At least, that's the way I see it.