It`s the mechanics. The story I described is that the dwarves tamper with items mined on personal computers (i.e. an increase in their economy), and in exchange, the dwarves demanded the trade of PC information about actions in the stolen countries. Since PCs went much further and had many more connections, dwarves could take advantage of having eyes/ears in the fields to update them, as they remain “locked in their mines,” as dwarves tend to do. So they benefit each other in an area where they each want help. Every trade bonus offered by Brevoy will dwarf that offered by Petty Varnhold or even Mivon. How can I give a commercial bonus for these “other colonies” while answering the “Brevoy question” if my PCs ask? I also like your exotic idea of trading. Maybe I have to steal something. I thought that the pcs wanted to exchange with Varnhold – since they have already made a friendly alliance with the nation – and try to bring the kingdoms closer together by marrying Maegar`s daughter (an NPC supplement that I played) with the baron of the PC. In other words – Rostland`s better rulers knew that there was a larger plan all the time – although they were not disclosed and must admit that they were not in a good position to trade. On the other hand, I offered them some small hippogriffs from an exotic animal dealer (very high profitability as an act of kingdom) and they offered him to have a hatchery for hippogriffs if they could have the first choice on these exotic frames. I told them to place an exotic craftsman and a stable in a neighborhood to give the merchant his place of work.
They could have a hippogriff cavalry army playing a leader. I did something similar. The PCs in my group earn a +2 to the economy of a trade agreement they have with Mivon and until recently (they just started the third book) they enjoyed a +2 to Economy, +2 stability (but at +1 consumer cost) thanks to a trade agreement with Varnhold. Qadiran slaveholder, not child`s play. Looking for people who may be ex-bandits or criminals in the realm of the PC….