Well the Flipside to that is people naturally accessorize as a personal identity. You see it all the time. Put 50 kids in the same uniform, like 25 of them will make it look different somehow.
So it makes sense for Super Heroes to do some of the same things. If you think you are god, then why not dress like a rockstar.
In Daredevils case in the TV series his suit wasn't made by him. It was made by a guy who is naturally creative, maybe he felt the horns just looked cool so he put them on his suit. The rest of it was more practical. Red for slashing, black for stabbing etc.
For Batman, he's actually not all there. The Bat Icon is very powerful in his psychosis, and really has nothing to do with will this work in reality.
As Bad as the Young Blood series was it really had it correct in that if Super Heroes were to exist they would not be hidden. They would have publicists, agents, and sponsors. Which imo is the best way to go anyway to endure yourself to the public, and not be hunted by the government.
When the X men came out it made sense to hype up the whole racial tension thing with mutants, but in todays multi media world none of that works anymore. If the X men were to exist we would probly love them.