It's useful to see how others apply vim's grammar in interesting ways. To me, it's like seeing a new design pattern. Not necessarily immediately useful, but a maybe a new way to think about something I may not already know.
I'll also add: So, one person puts up a long-ish page of examples. Is there anything inherently wrong with this? Presumably, it's useful to them and perhaps to some others. Doesn't that suffice -- it's the Internet!
Not every page needs to be carefully curated for global karma-whoring.