Xur is not for the people who have all these things, who have hundreds of strange coins. Xur is there for the newer players who have little of value and can't easily get strange coins. Getting 13 strange coins can be a challenge for a lvl 24 with little to no legendary gear. That's what makes Xur so special. For those of us who are Lvl 30+, Xur isn't intended for us anymore. We might still have use of him, but he is really there just to give lower level players a boost and relieve them from a painful RNG grind up. Raising xur's prices would defeat that purpose, as lower level players would never even be able to get stuff from Xur for a long time. If he wasn't in the game at all, there's a good chance that most of us may never receive the exotic we wanted. Even if most of these people find him worthless now, he was a great help in the beginning of the game, as he was supposed to be. Xur is good for Destiny, given the state of the game's loot system.