No because EVERYONE knows about Gjallarhorn and how crazy it is. The reason why Xur sold it before and so early was because everyone had no clue what it was truly capable of. Instead there should be a trade system in place so people can decide to trade there extra Gjallarhorns (if your lucky enough to own more than one.) If everyone had this gun it would ruin the luster of this gun and the thrill of obtaining such a wrecking ball. (EDIT:) I saw Xur sell Gjallarhorn but I had Truth and thought "I should save my coins I already have an exotic rocket launcher I don't need two." Boy how wrong was I. I did get it months and months later from atheon. But I will never forget my foolish mistake.