Originally Posted by
snuzzle
You're right. It couldn't possibly have to do with the fact that you get the stuff for the trading post in your garrison whereas you actually have to go out in the world for the lumber mill, meaning that trading post resources are much easier to get.
Nor could it possibly have any relation to the fact that you can have a trading post AND a lumber mill. If they nerfed one but not the other then that definitely means that my hypothetis is a "fictional issue".
Furthermore the fact that now you can spend your resources on other things in the garrison means Blizzard would in no way want to make sure players are making smart choices with their resources, instead of just being able to do anything they want with them at any time.
Obviously, this is a fictional issue.
While it's possible that it's a bug, if it's an intentional change, that is my hypothesis as to why.
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What? The vendor is random but it doesn't have anything to do with rep. The costs are static and only change based on vendor. One will have cheap herbs, one will have cheap ore, one has cheap leather, etc.