That’s because you don’t have anything that’s exclusive.
If you had some elite pvp mogs or stuff like that, you’d know the value comes from how rare it is, because you had to be playing at that patch, and that content, and achieve some rating.
The moment they let everyone have everything, there’s no point to collectionism and there’s no incentive to get exclusive stuff anymore. I always like to bring people to Deathwing mount. Everyone and their grandma got it, and barely anyone rode on it. If it was hard to get, it’d seem much cooler.
It’s a big game with lot of different player types, just because you don’t care about exclusive items, doesn’t mean it’s the general opinion and that no one cares either.