Many of the exotic rolls you can get in a week are only for exotic guns, the only exotic armor rolls im aware of are the PoE chest and night falls. Since those have such a large loot table to choose from it's a pretty diluted exotic armor roll. That's why I'm okay with Xur carrying so much exotic armor so often. However I wouldn't be opposed to the items being more expensive, especially since you can convert currencies now. Many players have an overwhelming amount of strange coins...