Enevhar Aldarion
Oh Wise One
I do still think that I'm seeing (and it sounds like others have seen) an exception to this, so I'm still curious about the game mechanics that control the trader, but it also sounds like nobody knows for sure how it works.
One thing I am thinking is how actively do your discovered neighbors post trades? I have a decent number of neighbors who regularly post trades, so even though this new neighbor is active and has probably been posting trades for as long as we have been on the map together, he is ranked 172 on Arendyll, because I already have a good number of trades in my trader, his trades never showed until I discovered him. Oh, and he has never taken any of my trades before, but that may just be from timing and not him not discovering me yet. And I very rarely see trades with fees.
On the other hand, my girlfriend has a city on Felyndral and she has a much lower number of trades on average in her trader and sees many more trades with fees, including from new cities outside her discovered area.