Yeah, because he has limited stuff for sale... If he sold the one thing we are all going to have to grind for in order to upgrade our shit then we just cut our potential play time after the dlc to 25%. Not to mention, new players would only have to hit rank 2 with any vendor (you can hit 20 in a day and then rank up twice in a day or two) and buy etheric? Light from xur then bam he's 34. That ruins the game