I love the idea, and initially I thought that it was awesome. It would be the ultimate safeguard.

I just think too many problems will be caused by a players ability to recall the trade. No one loses out but it would get pretty tedious after a while. Imagine if someone offered you more money and you recalled your item leaving the other player supremely annoyed. That's not even taking into account what Jay said about players trying to unnerve others.

If the world were simple this would be perfect. But it's not. Shame cos it's a fabulous idea.