My guess is that the person who actually invented Batman wasn't thinking about things such as sexuality. He is a super hero that beats up bad guys. All this speculation about his sexuality is kind of silly. The character has been around for how long without this being a big deal?
It may be that your sole purpose in life is simply to serve as a warning to others.
Well, he does seem to enjoy playing dress up.
"He who does not think himself worth saving from poverty and ignorance by his own efforts, will hardly be thought worth the efforts of anybody else." -- Frederick Douglass, Self-Made Men (1872)