Huh, I thought there was a stop to putting negative rep on accounts for no good reason. But I guess I misunderstood how that works. This isn't a topic I'm very knowledgeable of really just thought selling accounts was the norm but still a hot button issue for those who just don't like it and see potential for scammers to take advantage of people.
What do you mean? People are free to leave feedback as they wish and it probably wont be removed unless the user leaving it has been spamming them. Some people feel that sold accounts are untrustworthy so they neg bomb them. Personally I wouldn't leave feedback just for the mere fact that it was sold unless they were explicitly trying to scam with it.