I don't know why people leave feedback for accounts just because they are bought /sold. It doesn't really accomplish anything in the big picture, and only serves to drive the activity underground, which leads to a lot of people getting screwed over. If people didn't leave negative feedback, people would probably be a lot more open about what accounts are being sold/bought, which would be much more beneficial over the long term than the short term benefits of a few accounts getting bad feedback.
Personal experience. Every single purchased account I've ever encountered was done so for reasons that were not exactly above-board, to say the least. I'm sure there are a few cases where people use them legitimately for sig campaigns, but as a rule of thumb I do not trust purchased accounts.
Looking at all of the negative trust you have left (you have left a lot), only three mention the account being sold. The zedicus account because the account was sold is one. Goodnightcoin because he was trying to sell his account and was trying to take out multiple loans is number two. The third was a 2011 account that was trying to take out a .5 loan and you assumed it was a sold account for this reason. You also had 3-4 consecutive negative posts about people selling hacked accounts to only have the new owner regain control of the account.
All of your other negative trust was for other reasons. I think the most common reason was due to newbie+loan request, but there were a lot of "alt" of x scammer ones as well.
To relate the buying of accounts to lending (something you are involved in): if the sale of accounts was more accepted by the community, and you know how much a particular account is worth, then you can generally lend up to 1/2 of what the account is worth because they could get a lot more by selling the account vs borrowing money and running off.
@Quickseller: Did the person who you negotiated a sale price with provide any sort of proof he was the actual owner? Ie. signed an address that was previously attached to the zedicus account?
See my above post. I was in contact with him over three days and no reports of the account being hacked came up. A quick review of his posts did not show him posting any BTC addresses. As per above (one of the first few posts in the thread) show him participating in a group buy however it would have been difficult to know the address was associated with the account without looking at every single thread it posted in.
The main reason that I feel like bayuo was trying to scam is because he had not posted in ~a month, then creates a new account (to recover his "hacked" account) the same day the account is sold. This would have been at least 3 days after the latest time the account could have been hacked.