Batman has a lot on his plate. By day, he lives as Bruce Wayne, and by night he has to save Gotham City from disaster, and still make it home in time to catch a couple hours of sleep before going back to Wayne Enterprises for another busy day as Bruce Wayne. Batman has to take every opportunity he can to save some time, even if it’s just a couple of seconds, that’s why he uses the Batman Money Clip. He doesn’t have time to fumble around with a wallet while he’s patrolling the streets, but he can’t just run off without paying the hot dog vendor – that’s where this money clip comes in. Batman can just whip out the money clip, pull out a five, and pay for his hot dog in seconds. He doesn’t even have to wait around for change – he is a billionaire after all, he can afford to leave a nice tip.