It's not up to me or you to determine why there are so many brands of consumer products. There is not a moment after which we ban all further competition and new entrants. I hope competitors continue to innovate, so we have the best possible choice on a multitude of variables including price, quality, ingredients, etc.
I'm not exactly in favor of a command economy, but seriously, how many of these 80 types of deodorant -- or any comparable consumer product -- are fundamentally different from one another, as opposed to being distinguished only by their branding and marketing?