I do. I follow HN using a RSS feed ( http://feeds.feedburner.com/newsyc100 , from http://talkfast.org/2010/07/23/a-cure-for-hacker-news-overlo... ), and I often read a submission and its comments a few days after the discussion has died down* .

Seeing comment scores is useful, because it lets me easily see the "best" comments. I don't see the problem with showing comment scores once the discussion has died down.

It's also useful to be able to see comment scores when browsing old threads, looking for specific information (using searchyc, bookmarked threads...).

*: of course, this approach is good for simple HN "consumption", but participating is harder, since few people reads the comment I make on week-old threads...