Mainly it's the shortage of mounts, and the few people willing to sell them.That's insane the prices mounts go for on your server. On my server a 100% unicorn would go for about 5-6 mil.
Merching beats all forms of obtaining gold if done properly. Even if you don't make as much, you make more of an impact. Think about this, if I somehow farmed 1m in a day killing bosses vs. me merching 975k, the merching is better. Why? Because if you take gold out of the economy, it causes prices to fall(inflation). I've used the tactic several times in the past to sweep up extremely rare items for dirt cheap and flip them for 3x+ more gold. And when you get to 9 digits... ooo you know whats gonna happen lol.If you play a lot and have couple of devices, nothing in the game, including merching beats gold bosses.
On average, I make 250k-3m a day when I try. Or I can just go on for like 5 minutes, list and buy ah stuff, not do anything and make 100k-1m or so.