The mounts, gear, pets and whatever are also imaginary objects in a fantasy game. The same way you think there's zero reason to stockpile it, I think there's zero reason to spend it. Not that I have millions of gold; I'm sitting at 200k. Any gold above that I can spend, but I will not touch that 200k. I don't know, I hate spending gold. It seems the more I have, the less I wanna spend it.