Ah, well pointed out... I missed that, thinking about how in the case I mentioned it was the same poster in each. Obviously, the majority case is when it is two different posters.
In that case, I guess you don't merge points, votes or views. Merging is one way, anyway, so you specify which is being merged from and which to. I assume that is fair, since a duplicate question shouldn't be encouraged.
I guess you also don't merge tags or content either. You just move answers and comments, no?
Maybe marking as a duplicate and putting a link is more appropriate in most cases... but doesn't SO have some merging function in cases where it is the exact same question and all you want to do is have the answers in one place?
I guess after you merge you have to recalculate points as well. Anything else to recalculate? You delete the merged post, so it is all taken care of, isn't it?