"Exotic" recipes in Supply Bundles

I have yet to see any recipes other than potions and tabletop catapults being sold on vendors. Why is that?

 

Supply and demand. (very low vs very high)

I think part of the problem is that the "teaching" is simply done by trading, with no mechanic to restrict the trading by recipe level. If they put in a new recipe teaching system that could take skill levels into consideration, I think more would become teachable. (with a few still being explicitly non-teachable for various reasons)

But triage-wise, I think as something which has no effect on offline mode, and only makes things less inconvenient in online mode, we shouldn't expect such a change before "release".

But they really need to put it on the list of things to do. And while they're at it, make it not possible to "teach" recipes that someone already knows.