Because he's Batman

This is a few months old, but have people read this Aaron Diaz article about Batman?

The basic argument is that Batman has actually become the LEAST realistic/believable hero in comics by virtue of the insane amounts of skills attributed to him and the cognitive dissonance of  spending more money than most national defense budgets in order to combat street-crime in the least efficient manner humanly possible. It's a clever read.

For people who mainly know the movies or TV shows: In order to make his "usefulness" when sharing a world with Superman etc. make sense, the comic Batman is generally written as the World's Greatest Human - a master of all martial-arts, a human-computer level intellect, possessed of essentially-unlimited cash resources and the ability to spend them on entire space-stations without attracting attention.