I don't get the fascination with reading/watching other people's Nuzlockes either. I guess it speaks more to the 'lets players' who like watching others play games.
I just like the general rules for a Nuzlocke since it adds challenge to a pretty generally easy game. It's also a way to get me to use Pokemon I wouldn't necessarily use, otherwise I would use the same 5 Pokemon literally all the time with every game and one random Pokemon I don't care about for HM slaving.
But I've done stuff sort of like Nuzlockes since Red/Blue with Monotypes (pretending I was an aspiring Gym leader, lol), at least in the sense of ways to make me use different Pokemon. Nuzlockes are kind of a variation of something I already did in that sense.