Is buying alchemy resources from mage/herbalist/alchemist profitable?

Macefighter

Apprentice
Yea.. Just wondering if any other professional potion keg makers buy their regs from the NPC alchemists, herbalists and mages in town?
It seems like its the best most profitable way to acquire potion keg making resources. Im almost certain player vendors farm regs off the NPC town merchants then sell them for a higher price on their vendors, because I havent seen any other way to collect a good amount of regs.
 
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