The individual editions can be grouped/linked now under a single title, so it's not quite as confusing.
I don't think it has anything to do with "bragging rights". I think it's better for pricing data and historical data to document all these editions. You can't deny that these editions exist and that there are differences between the editions (some relatively minor, but some significant).
Sometimes vault editions include improvements over the original. So, they aren't exactly the same.
I think it's more confusing for people not having these editions documented. Back when JJP was releasing edition after edition of WOZ, I was confused as to which edition included what features. So, I eventually documented them on pinwiki just to help keep track of them.
The same situation with MET and AC/DC--there are various editions of those, and honestly, I really don't know what all the differences are between them. But I think it would be helpful to make note of them and what exactly each edition looks like and/or includes.