Maybe just like many wonders why scam is not moderated on this forum? It is probably about giving everyone the freedom to do whatever they want, with the community then saying what they think about it through feedback and flags.
I think it's also about workloads for moderators and their responsibility. Imagine what if they would to check every scam accusation, all topics in Reputation board and make decision whether someone is scammer or no. And don't forget their main job - moderating forum. I think it would be too much for them and I think current system when everything is left for community to judge. Though, it's far for perfect...I think that account sales isn't forbidden because it would be difficult to prevent such things. Even if you have extra information like IP logs, it's not always proof that account changed hands.
But yeah, there is some things which never was clear for me, like why it was completely OK to sell accounts in past, escrow for account sales or using it as collateral.
Isn't Benteke a true scammer? I was a huge fan when he played for Aston Villa, thought he was from another planet, then he was sold for 45-50million or something to Liverpool (my favorite team).... Then the scam started, no goals, bad playing, injured etc 
LOL, you really made me laugh . When I saw OP's username, my first thought also was Christian Benteke .