selling orbs to vendors

a stack of orbs ( orbs of augmentation ) sells for 30g a stack of 30 , while if you unstack them 1 by 1 , they also sell for 30g each , so if you sell a stack at once you get less gold way less, fix please a stack should sell for 900g not 30g

maybe stack of currency are not intended to be sold at vendors?

Yeah they can fix it, but most of the playerbase will not sell them to vendors. They use them for Trade or Crafting, like inteded.
And uses Other Items, that gives more gold at vendors