Part of what makes Batman one of the most popular superheroes is that, unlike Spider-Man or Superman, he doesn't have any special powers - other than a lot of money. So how much would it cost to staff and stock your own Batcave? Centives, a blog run by US economics students, analyzed "Batman Begins" and "The Dark Knight" to calculate what it would take to actually become Batman, adding up everything from martial arts lessons to Alfred's salary to the list of equipment recommended by Lucius Fox. The total? A mere $2.8 million.