Not entirely true.
Stratics hasn't allowed the selling of things for RL currency for a really long time, because of the Fansite agreement, but did allow the trading of accounts for gold and whatnot.
But, that proved to be a huge can of worms. People rarely used the account trading service, and so disreputable folk would sell their accounts for gold, then in a few months reclaim them with all the new owner's stuff, and since there was no official record of the transfer EA would return the "stolen" account to the original owner.
So being an area that resulted in a lot of trouble, and I mean a lot of trouble, it was disallowed.