Also which of the examples do you want specified?
If you do such a trade and do not realize that minutes after seeing the trade happened, you will not get anything back, nor will you if you use that money since the trade will be fully reverted which means the other side of the trade will get his/her gold back as well.
EDIT: Removed some "obviously"s.
It amazes me that common sense seems to be very very rare in this community or some people just try ignore it to make a point.
It is common sense that rules should be clear. It is common sense that common sense is subjective and subject to change. It is common sense that anything unclear in rules can and will be used to justify unjust punishments. It is common sense that interpretation should be kept away from the law. It is common sense that never stops drawing us back into uncreativity and obscurantism. Ideas never progress with common sense. Common sense isn't logic, for there aren't any clearly defined concept or rules in common sense. As such, it should be ignored as much as possible when people try to make a point.
I love how we all are (rightfully) screaming about the Patriot act or SOPA, yet somehow doing the exact same thing ourselves isn't a problem.
However, I do understand this is a game, and a minimum of goodwill and benevolence is expected from everybody. Just like with 99% of the mods out there, the development and administration aren't and never were democratic, as well as not being required to be.
I'm fine with this rule personally, I just don't like the fact that nobody points out the problems that can and will emerge when we will have borderline cases. Let's say I fucked up the item selection, and sold my +3 heavy lance instead of my +3 KAS, but for the KAS price. Determining wether I actually got scammed is hard because it depends on the relative value of the HL and KAS.