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I also notice that posts with higher payouts or rather Huvers with a larger stake get more comments. And it will probably be mostly because of comment farmers.
That is the reason why our curation service upvotes quality comments on all blogs.

I see some, like @godfish mentioned, comment farmers. Not just on mine, but there is one friend in particular wwhose posts are overrun with sycophantic flattery, which has nothing to do with the quality or content of the post.