I understand that the heart of your post is good-natured, but I simply can't ignore that it contains two blatantly incorrect insinuations of truth which are not fact based.
First, your post follows the general assumption throughout this thread which is incorrect. These are not trial accounts. Trial accounts have a yellow and green badge by their name that cannot be removed under any circumstances.
The badge is actually this, which in Japan is used to indicate novice drivers:
http://en.wikipedia.org/wiki/Shoshinsha_mark
Point of fact, these are not trial accounts. They are paid accounts. Trial accounts cannot enter Abyssea, which defies the prevailing logic of your post.
Now let me explain something. FFXI with all expansions and 1 free month of play was selling for 9.99 on amazon last month. It has sold on Steam for as little as 4.99. If the company that makes this game were sincere about limiting the issues you seem to care so much about, the first thing they would do is stop practically giving away the game for free.
But make no mistake, it's not free, even at 5 dollars. And these "trailer trains" as you so cleverly coined the term are paying customers that bought the product. They are using it how they see fit, and an SGM in this thread just told you it's not the job of GMs to police the activity. Report them to the special task force as instructed.
Second, trial accounts are not being used to manipulate the auction house. PERIOD. You have clearly never used a trial account. It's not that they cannot buy or sell on the auction house. It's not that they can't trade. And it's not that they can't send or receive deliveries.
IT'S THAT THE THREE FUNCTIONS I JUST MENTIONED HAVE BEEN COMPLETELY DISABLED AND DO NOT EVEN APPEAR AS MENU CHOICES.
To even click an auction house counter is completely disabled.
So no, suspicious trades are NOT coming from trial accounts.
They are paid accounts.
They are a product of Square practically giving this game away for free.
At the point you can launder 55 million gil for the price of a 5 dollar license key, it no longer becomes relevant whether it is free to do so under a trial or whether it involves a negligible fee.
It is a small opportunity cost. The price of doing business.
But don't insult anyone's intelligence by pretending that
1) Square is clumsy/lazy/stupid enough to allow trial accounts to make such transactions
&
2) The persons engaging in this behavior haven't invested a significant amount of time and effort into formulating a solution to the problem of being banned for bad behavior.
The reason people are gaming the system is precisely because they HAVE outsmarted it, and until an admission of the facts is made, which is that the methods employed are organized, sophisticated, and effective, then all of this is really just a bunch of cry-babies on a forum whining that they didn't think of it first as far as I'm concerned.