[Kaimetsu]

I would say that scamming should be illegal, but it's a difficult thing to enforce.

Would be interesting if trades could be reversed until a finite time has passed (the length of which is probably relative to the value of the items being traded). Neither party can drop or trade their side of the bargain until that time has been cleared. Then scammed users have a chance to instantly fix things if they realise that they were fooled.

Of course, it'd probably require major modification to some systems, and that just ain't gonna happen.