Why do you do this? Ya, I know, you like to argue so any argument is a good one. So…

It out balances the game. It’s easy to buy legendaries {New Headhunter camp merchants} all it takes is coins I can get by knocking out sorcerers dragging them to the sink hole headhunter camp. There are 4 real close and live sorcerers are worth some coins.
It’s the head hunter event{?} that is throwing you off. It’s a big pay out for something no more difficult then a small nordheimer camp, or a few wights. But I can make as much coin just capturing sorcerers of any level; quantity vs quality.
Volcano - ??? & ??? (missing both new merchants) Daggers of nameless days,
You can buy the Warspear of the Black Circle for 15 coins. Basically a tenth level could buy an artifact.
Which daggers would that be? Daggers of nameless days
How do they compare to other, harder-to-get daggers? Ledgendaries are RNG and you know it
Is it really harder to kill a sorcerer within a mob of other NPCs than it is to simply bleed a giant spider to death? Never said it was harder, it is way, way easier. Not much different then a corrupt croc with friends.
Why should it be hard to get these daggers? Because they are legendary. What an absurd question.
Why does any of this make buying of the legendary weapons wrong? Shouldn’t the fix be to adjust the price or the difficulty of killing sorcerers or any other related factor? It way out balances the game. Why fight a world boss for a key for a RNG legendary that could be a PoS, when I can just knock a few sorcerers upside the head and buy a nice legendary?
You make those coins as hard to get as chest keys and I’m ok with buying legendaries. Hell right now they are easier to get then gold coins.