100 per day is a decent return on investment. Except tanneries, which are currently bugged (sort of - basically, hides become as valuable/more valuable than leather, so they make no profit).
Hmmm , that's not the case for me in my recent playthrough as trader.
Hides cost around 45 while leather around 150 give or take.
There is certainly some bug with leather related to its marked profits , for example i always see it marked as green ( with 1st + 3rd trade perks ) no matter how much it costs. Perhaps that's what screws tanneries up atm.
Funny thing is , i don't think that was the case at the beginning of my current campaing - only later on - but i can't remember for sure.
I'll double check on another playthrough in the future.
Its hard to figure out exactly what's going on by just playing , hope it gets fixed.
Tannery went from champ to scrub.
Lastly , i too want to confirm that wool weaver provides great results.
Other workshops can spike high too , but they don't seem to be consintent for me , changing from ~10 to 150 every day QQ. I've been experimenting on 5 different aserai towns , and wool weaver was the best by a large margin. Doubt it has something to do with the area , since there's barely any sheep villages down there. It seems to be the same around the world.
Currently workshops seem slightly disappointing to me.
PS. Haven't bothered with feeding raw materials into towns , those were all results on auto pilot.