Like a good book, movie, or music, repeat enjoyment isn't necessarily bad. It doesn't detract from my enjoyment of HN, especially when you actually through the links from previous submissions. It's been reposted a number of times for obvious reasons.

Regardless, if the point of the comment is to note the number of reposts, then it's purpose harms HN more than simply using existing means to resolve reposts. Again, within the context of trying to make a point, it is worthless.

If the intent was to post additional commentary found elsewhere, then it's valuable.

Yes, their is a distinction between the two.