The worms are easily gotten from zombie farming and plants (alchemy farming) but if you spend all day farming worms then you dont have the time to fish as much. The fish stand a chance to drop the Perfect Roe which sell for 10k each so it is a convenience thing for most people, takes between 5-12 bait for each fishing hole to burn out. Plus achievement for all the rare fish from each zone.
Yes, in Summerset you can get Pyandonean motif pieces and valuable Psijic recipes. If I remember correctly that is.
You can get Pyandonean motif chapters from Pyandonean Bottles which can be fished anywhere in Summerset, not just sea.
The Psijic motif chapters drop from Geysers.
@Verbal_Earthworm No, I mean the Psijic recipes, not motifs. The Artaeum takeaway broth for example. Those are only obtainable from Waterclogged Psijic Satchels when fishing in Artaeum, which only has Ocean fishing locations as far as I know.
Also, I didn't claim it was only Ocean bait that is affected. That other bodies of water work to get the pyandonean motif doesn't diminish the fact that the bait price per piece rises. You could expect similar situations with other bait and fish from their respective water type assuming that it is due to the Pyandonean motif and not the Psijict Recipes.
This Bosmer was tortured to death. There is nothing left to be done.