I certainly would love Fort Joy merchants to only sell one copy of each skill book and not restock it on level up. Also +1 to not selling level 2 skills. Gawin selling teleporter book and still telling me to go fight crocodiles is the worst offender.
Also the story treats making it to seekers camp as something great, finally there are people who can help you. But they really offer nothing new. I can go to Fort Joy and buy the same stuff from mercants there just for a lesser price. Quite funny actually how prisoners magically get better equipment than magisters. Also prisoners selling source skills and magisters being fine with that.
Suggestion: for the seekers camp to feel like a real upgrade and to make merchants less immersion breaking, Fort Joy merchants should be limited. They shouldn't sell skills above level 1 and they shouldn't sell gear above level 4.
Another suggestion to prevent the player from taking the same op combination (haste, adrenaline, teleport, rage) on every hero. Skill books should never restock. Only one adrenaline per merchant, no more builds being essentially the same.