And he isn't going to Boris,
I think Sannom meant that the merchant accosts you on road that is on the way to Boris. eg, if you're trying to do that 'avenge my husband/kill Boris" quest, you're going to run into the merchant, making it unlikely most people will miss him, if one is trying to do the side quests anyway.
I seem to recall him showing up for me even after I'd already dealt with Ranjali...I'm pretty sure it was after, since once I had killed the bandits on the way to see the merchant standing at his wagon, the bandits on that small section of road did not respawn every time I went back and forth on that road again....whereas they will respawn if you meet the guy before dealing with Ranjali, which I used to my level-grinding advantage in my 2nd playthrough. But maybe I'm getting my memories mixed up. I'll check it some time.
Edited by LadyCrimson, 09 July 2011 - 11:24 PM.