The flip side is that it is less visible in a pub. It can sit in a fridge unnoticed as opposed to being on view at the bar with a keg font. Unless it is pushed by the bar it can be forgotten about.
I take your point about hooker but I think one of the reasons for its success has been its availability and visibility in bars. Ideally you would like kegs AND bottles but I'm guessing that requires more investment which is tough for a startup.