Not really unclear, but I guess I'm wondering why? With all the trouble about space in the wiki, why add these additional characters at all? Just curious as I'm sure I'm missing the point of it all at this early hour!
Those couple of characters are worth it to us in this case as especially with couponsDOT that we spend so much time searching and searching in their pages with zipcode after zipcode trying to locate missing coupons. If we know we had a direct coupon, then when it is removed from the site, it's super simple and we're not wasting time digging looking for it.
So though we always are keeping a close eye on wiki space constraints, this is just such a time saver for your wikibees and others looking for a Q that may have gone dormant.