This is how I expand RGO's - I have no idea what they do, but I think they produce goods, which can be sold on the market, and cover population needs, and are supposed to be quite good in the beginning. Supposedly later they fall off. The profit that is shown isn't true - you get only a fraction of that. And you need people to work it - the labourers who can do it are on the left, and the peasants are on the right. Actually if you have enough peasants, in time they get promoted to labourers and you get the building operational. So I try to keep spamming them to promote the peasants. For me in the worst case in 5 years 1k labourers are promoted, in the normal case it is like 1-2 years. But my values and priviledges of the estates might be helping me here, cuz I'm not doing what all the streamers suggested.