When I watch Sumo one time in our house, I'm a bit entertained but overall it is a bit boring because one match lasts only for a few seconds or 1 minute at most.
Maybe for some it is entertaining for some reasons. I think there are some gambling sites that also have Sumo betting don't they??
Not much of fighting and yet I feel the entertainment on that sports and I believe its already a culture that we can't erase from today's generation. Maybe a few are interested to watch the fight because of not so extreme fighting, but this kind of wrestling is classic and until now it brings fun to me as always.