I'd much rather drink a great tasting beverage than swallow tablets. Tablets may be cheaper but they come at a price which is flavor. Also I've noticed the energy drinks out there that don't contain caffeine work much better but they taste gross, ex: 5 hour energy.
Just as I don't take caffiene pills as some sort of casual, powdery snack, I don't drink energy drinks like I do soda. Energy drinks and caffiene pills serve one purpose for me and that's to stay awake, not to enjoy their flavor. So I don't really get what your point is, because nothing's stopping you from taking a much more effective caffiene pill and also casually drinking an energy drink at the same time. And if you're rested enough that you're only drinking the energy drink for a small boost in energy per sip, then you wouldn't be taking a caffiene pill in the first place.