What competition would a store that sold energy drinks have?

Shoe stores such as Payless have a lot of competition such as Aldo and other shoe stores. But a store that sold flowers wouldn't have as much competition because there aren't that many stores that sell flowers. What about an energy drinks store? Well actually it sells energy drinks, sports drinks, energy bars and whatever gives you an energy boost. What competition would it have? Also why would a store like that succeed. Example: energy drinks and sports drinks are a growing trend so many people buy them. Any other ideas?