hello, I would be interested in purchasing the mount for 50k, but I'm on horde. I'm assuming that wouldn't be a problem, assuming that you are just going to be pulling it down for me to tag. I would be willing to pay the extra neutral auction house cut.
You can't tag it that way anymore. It is now tagged to the crystal user and needs to be handled via masterloot. You just need to make a level 1 and get summoned to Vale with your seller and ensure you walk up and melee it or wand it etc. You will be elgible to learn it on that toon I am pretty sure. You'd have to double check with a gm or perhaps wowhead.