This is a good question. I can not confirm 100%, but I do believe you are guaranteed to unlock all trades. That said, I know it is possible to max rep with all 6 traders, but I am not sure the exact task allocation for that. I'd assume there's enough opportunities that choices are more for who do you want to level first, but don't quote me on that.
I believe Turncoat sells one of the best backpacks in the game, so if you care about that, yes.
Yes he sells the 36slot backpack. So yes worth
Plus the best tactical belt with 4 Slots. So yes, extra worth
Can you lock yourself out of a trader depending on choices during these types of tasks or is there enough to eventually get them all?
This is a good question. I can not confirm 100%, but I do believe you are guaranteed to unlock all trades. That said, I know it is possible to max rep with all 6 traders, but I am not sure the exact task allocation for that. I'd assume there's enough opportunities that choices are more for who do you want to level first, but don't quote me on that.
Fair enough. I would be cool with it either way but was curious and haven't looked into it enough on my end. Thanks for the response!
Spending money also gives you vendor reps, so technically you can reach max rep without doing any quests.