I suppose it's how you look at what is a 'waste of effort' and what isn't. I think, from Blizzard's perspective, the more feedback they get regardless of source can never hurt. I would agree with you that since WotLK the "vocal minority" have become more and more jaded over the years, but I think there is an unaccounted for group that does read these things and never posts replys about them. Maybe a friend does read up on them and passes that info along to those they know that don't? Either way, it's never a bad thing on their end to do it.