The inevitable howling from Karens when their children get ahold of a 64 ounce Big Gulp of the stuff notwithstanding, the main issue is that fountain availability would pull back the curtain on the supposed value of energy drinks. These are no more expensive than Coke or Pepsi or Sprite for their bottlers to produce, but they’ve successfully bamboozled the public into believing that a Monster or a Red Bull or whatever is “worth” 4-6x more per ounce than a normal soda. This is obviously bullshit, but if you were able to dispense it at the same rate and the same price as normal soda the jig would be up and the energy store brands would have an absolute cow.