Because there's more of an entertainment part in today's sports world ,where the teams have contests or games between periods, you need time for the ice to dry. In the NHL all arenas are required to have 2 Zamboni's and they all have entertainment in between periods so they've stretched out the intermissions to 18 min. But more importantly , I suspect if any of the teams in the Elite league own the concessions, it gives them more time to sell more beer, hot dogs, popcorn etc. I'm not sure if the Devils own the concessions or not