There has been a few occasions that I've translated Spanish posts because I knew the author, because they used to post in English. I haven't left comments as the topic has been chit-chat, nothing interesting.
The underlying issue is that not a lot of people actually read the content - no matter what language it is written in! :)
You mean the author of the post not reading the comments?
If yes, then I agree. I see a lot of them can't be bothered to reply to comments, which is rude in my opinion. Those commenters should stop commenting on these authors posts, but if the author is a curator at a well known curation project, then you can see why they are commenting.
I personally stop commenting if I see the person can't be bothered to reply, I see no reason to waste my time. It's common sense.