As far as i have noticed there is a strict rules on how to not spam but what i have been noticing is forum members who reach higher ranks like legendary member and hero tend to sell their accounts off(Some of them). What is the point in engaging ourselves in the forum for weeks and years together to reach better ranks while some of them get it easily just by paying off some money? We will have to stop this!
Then don't engage yourself in the forum if you think it's unfair. Or even just buy a Legendary account yourself (not recommended). Why are you so concerned with other people and their rank? If you don't like this practise then don't partake in it or ignore it. Why don't you even just aim to achieve Legendary rank via your own merit so you can say achieved it without having to cheat your way through ranks? Just because others may cheat and bypass the system doesn't take away from your own achievements or contributions here.
Also, I wouldn't be against disallowing account sales here either, but the logic is that they would still happen just off site. However, I have suggested that people are able to purchase new donator ranks such as Silver and Gold Member which would give you the benefits of a Full and Hero-member account respectively. That would pretty much kill account farming and sales in the process so it's win win in my opinion.