I use two. One when I'm doing audio editing and have to be crazy precise and one for gaming. I could see why 99.9% of people would only ever need one though.
I also like my mouse cursor gigantic.
I disabled all the other DPI choices on my mouse since there is only one setting that works best for me. I don't like the pointer to fly across the screen from a nanometer of mouse travel nor do I like to have to pick up the mouse to buy real estate to move just a few more pixels. One setting. All the rest is gamer marketing wank.
OSs have settings for the mouse speed too - some even more ludicrous than the hardware - and god help you if you select an extreme setting, you gotta get that cursor back there to fix it!
It's for niche use cases. E.g. ludicrous speed is really nice for a wireless mouse when casting to your 4K tv.
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