hope somebody knows ! I've seen them and wondered too! mind you I dont think they look very pretty either !Would need to be a REALLY good reason use before I'd consider fitting one !
I've never liked the look of them either, but have always thought it was just the owner trying to make the boat look more like a conventional boat with a bow rail.
can't see any point in that really, if it was on the outside, maybe!, i've got what could be called a bumper on mine and that save the bow/tube attachment from getting damaged