Just finished reading all the cards/events. Awesome stuff. I really like the events.
I do think Pathfinder is justified to be more expensive than Lost Arts. It's true that +1 Action tokens add so much reliability to a deck. It lines up a village with all the copies of a card that you really want to play with a village. But +1 Card lines up a Lab with every copy of a card. That's really, really good. Being able to increase your handsize lets you get away with more stop cards in your deck, in a way that a deck full of extra villages cannot do on it's own.
About the travelers, don't underestimate the Peasant line. Yes, upgrading Peasant and Soldier is a little rocky due to them being terminal, but there is strong synergy between Teacher and Disciple. Get one Teacher, and keep Disciples around to play cards with tokens on them, while getting more of those cards. It's a shame Teacher is so slow at adding tokens. You can't play it again the same turn it is called, and it can't be called the turn it is put on the Tavern mat. You can only add/move a token to a pile every 2 turns with the same Teacher. Still, while Champion makes your whole deck non-terminal, Disciple helps your deck have more Action cards with Teacher making those cards better.
Okay, the Page line seems a bit unfair because of Warrior. If Player A trashes Player B's Treasure Hunter/Warrior, Player A gets to Champion a lot faster than Player B. Champion itself is quite absurd. Perhaps the treasure gaining of the earlier cards in the line slow down the desired increase in action density enough to make Champion a bit more fair.
Oh and Port, just...wow. Like come on, that's a $2 and 1 +buy discount compared to buying 2 Villages. That's sounds so good.