Suggestions from far north.
1: Tournament morale boost = i just wonder if your mighty lord and leader wins tournament and the hearts of the not so pretty ladys/lads, wouldnt it also give some sort of morale boost for his/hers troops aswell.
2: slavery and salt mine = Selling price for troop level is one great and that how it should be. I dont know how the mechanics for salt mine works, but wouldnt it make some sense that elite and harder troops working there would also mean more profit for player?
3: ok this is rather far fetch and might be just to complex for game (to much work) = Village buildings meets the needs of your shops/factorys, demand and supply.
Meaning of this is that village that you own would produce some sort of raw material always after building needed improvement: like sheep farms, cattle ranch for hides, grain fields would always produce some amount grain for static price -> so you would have raw material for your brevery, max profit. You get the idea.
Even going far as relation based production efficiency - more relation more products, or vise versa.
Not sure how the game mechanics or economy would react that tho.
4: Guest suggestion - merchant job from guild master, royal family or some lord wants high quality products, silver 10x stacks, furs 10x stacks, fine cloths, dyes great amounts. Exp/good amount cash and relations boost for faction/city. Ok writing this down makes it sound pretty lame tbh.