Alright, to be specific, I wasn't so much concerned about the monetary side of the 'investment'. Rather, it was the subject of the hate reduction. You are right, the buildings that are part of the Manor village to start with have a net 0 hate, increasing it if it is destroyed, only decreased again if the rebuilding is financed by the lord. My actual assumption was that only one improvement of certain type could be built (so only a single Apiary or Large horse herd), so that wasn’t a part of the question. With the exception of roads, which clearly state ‘per mile’. I also wasn’t asking about building dozens of villages. I was taking the ‘expanded population’ mechanic into consideration, combined with the ‘build them homes and fields or the turn to banditry’ rule, and aligning it to the rules of building a ¼ village, a hamlet, or a full village. (although, strictly speaking, the numbers don’t work out, a hamlet is 100 commoners, a village is 500 commoners, ergo, a hamlet can’t be ¼ village).
So, let’s consider that Sir Whosit has been running his land pretty well for the last year. Come winter phase, he rolls the population roll, and boom, he 100 to many commoners for the current size of his village. That means he either builds new accommodations in the current village, or he builds a shiny new hamlet for them. Both mechanics are there:
(Cluster of (Commoner’s) Houses
A cluster is 5-10 commoners’ huts (about a quarter of a
hamlet). These peasant hovels are house, barn and byre all
in one so that the people can stay warmed by small fires
and the presence of their animal and rotting hay and cabbage.
Cost to Build: £8
Personnel: Eight or so farmers and their families,
each approximately 5 people, plus a few animals.
Reduce Hate (landlord): 1
Hamlet, or ¼ Village
This includes the structures for approximately 100 people,
including outbuildings, animals, etc.
Cost to Build: £30
Reduce Hate (landlord): 3
Entire Village
This includes the structures for approximately 500 people,
including their outbuildings, animals, etc. but not the village
church, bakery, mill, well, etc.
Cost to Build: £150
Reduce Hate (landlord): 15
If you combine these rules, instead of making them exclusive, then it seems like building up your population and increasing the size of the settlement is one way pacify them. Combine in further subtle text, like a manor and village produce 4-8 libra, and the populations of different types of settlements on page 7 (again, BoM), finally, the idea that being a good landlord comes with the increases of population, the added glory for increased income, etc. What you have is a metric for increasing the conditions of the holding in order to benefit both the land holder AND the commoners. On the other hand, what’s the point of even bothering? If no matter what you do, they are just going to freaking hate you, why worry about it? Hell, letting them turn to banditry just seems like good adventure hooks. “Woohoo! Another 100 saps to hunt down and brutally murder… er, I mean bring justice to!” Of course, if they hate you enough, that won’t be a problem either. I mean, it’s not like we are talking about a game where traits like generosity and justice are adhered to. Wait, yeah we are. I personally have no intent on playing the Sherriff of Nottingham, here. So, why should I be punished, as a player, as though I were.
Oh, and to counter the earlier comment about it not being economical to build hamlets, that is true until every year you income is reduced to negligible or meager because your commoners hate you. Then that one libram a year is looking pretty important.