As always - Lots of theory ---
A new question/idea: when Lorgalis owned Ly-Aran, the whole sea-trade of Lehys and Norek was also heavyly endangered. And only U-Lyshak, through it?s Duchy Plasidar and it?s ships in Gul, could offer some safety through escorts.
This would have cost Lethys dearly.
Rhakhaan, through ambassadors and other contacts would inform every power they had contact with that Lethys will offer deals to traders. Lower taxes, subsidies to relocate their company, free 5 hour(?) docking so that ships can Dock - unload - leave. Rhakhaan would already have ships in the area, so they would focus more on the need to ensure traders safety. With the Lord of Ulor working hard on conquest, U-Lyshak would be counting everyone of their ships, as anything in the bay may be fighting for it's life very shortly. I also think that Norek, although still a sweet spot, does not make everyone that needs time to sell their product feel very safe.
Norek's prices would go up, I can promise you they are paying higher taxes to the crown (war time tax). Norek and the Kingdom need to bolster their defences to protect from the inevitable attack from Ly-aran (or directly from the bay). Some traders will be ok with the increase in price, others will move along.
One of the things I always wondered was Naval Powers in Rhakhaan. We don't see all that much ship info, as the waters around Jaiman are treacherous. Lorgalis chose the Bay, not just for it's staging area, but for it's comparatively safe water. From the Cannon information, I never got the impression that the kingdom's on Jaiman where every really water savvy.
Also, considering how many ships would be travelling near Plasidar, I don't think U-lyshak had the sea power to spare to escort ships from point A to point B. Those war ships have important things to do, keep the bad guys away from U-Lyshak waters, but if you have 6 warships helping 12 trading vessels (it is never that neat), and those warships are not in possession should an attack happen, you have a huge hole in your defence or worse, not enough power to stop the invaders.
NOW, at this point, I can see Norek having "issues" with pirates. Some industrious individuals, from Norek, that realize sometimes you just have to take matters into your own hands. Norek would probably even swear at those pirates, as they drank that wonderful wine they bought from those same cursed pirates.
Still short on details...