https://www.wowhead.com/quest=13103/...for-glowergold
This quest is terrible with the current spawn rates.
It would be one thing if it was just an annoying daily, but its existence is bad for the server.
The comically low spawn rates incentivize people to spend extended amounts of time in dalaran, which is apparently something the devs do not like (considering you get manabonk mail spammed and autologged for lingering too long, even if you're active.)
I would guess that server performance takes a noticeable dip on days this quest is active.
This is probably not worth the marginal increase in Northern Spice demand that is created by the tediousness of this quest.
It would be beneficial to the players and devs alike to just increase the spawn rate of the wine glasses.