But it is. People will look at a site like HN, say, "Ah, there are lots of really smart people on here: this guy has done this, that guy has done that, etc.", only to find out it's really just pg arguing with himself. It's deceptive because people believe they are getting 500 independent evaluations when really they're getting 5 original responses times 100 falsifications of what those five people think someone else might say. It's not a fair way to represent the site to its readership or participants.
If you say, "Ah, my party will probably only be three of us, I better pay 100 people to stand around so that I don't look bad", do people normally think this is an honest practice? You're still perpetrating a deception that could have real consequences.