I don't get it. I'm nearly 40 so I'm probably not supposed to although I do watch quite a lot of youtube and know who these people are.
The crux of the matter for me is that even if I likes the videos one or both of these guys make make and watch them religiously, why does that mean that I'd want to watch them boxing badly?
I have the same beef with dancing and ice skating bollocks too so it's not just for this with these two."I like your acting/singing/sporting performances so I'm going watch you do something completely unrelated to that and you're shit at it". Why? If I like dancing I'll watch pro dancing contests, not a middle-aged ex cricket player trying to dance.