I donno about you, but I've seen some people getting scammed, namely new players.
What they would do is that they would offer a fair amount of CE or Crowns for something, but quickly switch it to a very low number, such as 1.
This might not sound like a bad thing to the experienced who check over the trade, but many new players don't really look over the other person's side and continue, and get scammed. Anything to new players is pretty much important.
I think that they should add something that notifies the player every time the other person makes a change to their trade or so, or make a new trade interface that is bigger that asks them again if they want to trade after the first confirmation.
Pretty much try to revamp the trade so that its easier for those who don't pay attention and make less chance of scamming.
I'm not sure if this will get supported much though...
Especially from the last game's forum I come from. ._.
That's... really the player's fault for not checking. If they're smacking on the Confirm button over and over in a senseless and uncaring manner then it's not really a scam. The game already asks you to confirm again before a trade is made every time any side makes a change.
And really, if they're not bothering to over-check it even if the game launched a pop-up like when learning recipes they'd just smash that too without a care in the world and still get "scammed."
If anything once they pass through that the first time it should teach them that, yes, re-checking before hitting confirmation is always a good thing. I really don't think the trade system needs any change -- because this is not a problem of the system, it's a problem of the player not being careful.