Would you pay $500 to have access to an auction house anywhere in World of Warcraft? Based on the current prices for WoW Tokens, that’s what it would cost you to pick up the prestige mount available right now in the Battle for Azeroth beta, which is priced at a cool five million gold. To put this in perspective, the last “utility” mount added (which has a vendor and transmog services) cost 120,000 gold, or the price of one token (which would still leave you enough gold to buy other stuff).
Of course, the math there makes a couple of assumptions. It doesn’t include the discount for being Exalted, which is significant; nor does it take into account that token prices and the availability of gold are likely to change over time. Still, it seems like there might be better investments to make, such as… well, even just banking some tokens, yes? It costs a lot of money.