Yes, it is an interesting aspect.
What is possible however is to edit the post after CPing, and make it look like something it is not perhaps. Yes, the history to the edit is there, but there is also the potential for taking payment on something that wasn't the original.
I have seen some users CPing and then editing in the original post to make it look like a new post. it does make it look nicer, however it also takes away the "warning" that this is a cross post and therefore anther instance. THey are doing this on their own posts of course...