I got tcg pets in the auction house for 15k when many where offered at once. Now the same pet goes for 150k. Similar stuff happened with mounts. So how much is it worth? Because the mounts you buy from NPCS in the game cost always the same. The company sets the price, not some fans who gamble on the demand of other fans on rare items.
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When I can resell the spider mount and it's a limited edition that you can't get from the NPC after while then I could buy two and sell one about a year later for 10x the price. That would be similar. But it's not similar at all.