All of those examples are extremely outdated and have been rectified otherwise on the forums. As I said to you in the PM's, they were all reprimanded for what they had posted. RWT trading is limited for players-to-players. Admins have sold items for real world currencies for one very simple reason: they own the server.
As a former Admin, and someone who understood the rules very thoroughly, I am telling you that it is not permitted.
Ignoring the fact that it is humorously petty to think that someone would trade Gigas for a Runescape account, this is inappropriate and a clear breach of the rules. Not that you seem to ever have cared, Man, as you've always been one to ignore rules and policy.
But whatever floats your boat. If buying an OSRS acc gets you going, then so be it. Not going to beg you to be civil and respect the rules.