Isn't that what the whole exercise in collecting is? Usually comes down to farming gold. And gosh, some AH goblins are so good at it they amassed an astronomical amount of gold. So much they break the usual boundaries of "if you need gold just buy a token, it's more efficient", well good luck with that if you aim to have hundreds of millions like some of these guys. It's up to debate what's more effort, farming ~8mil gold for mythic Argus mount, or farming mythic raid to get your own non boosted kill.