If anything buying from Xur is rarer then getting it in a drop. Let's review, I have 3 characters, 3 nightfalls, 3 VoG exotic chest, 3 VoG Atheon Kills, 3 Deathsinger kills, 3 Crota kills. So a total of 15 chances a week to get Gally. Okay, now run the weekly 3 times, get your strange coins, you now have 1 guaranteed exotic weapon for that week, but only ONE chance for it to be Gally. 15 chances to Xur's 1. So is buying from Xur really such a bad thing? It allows for just that one exta chance at an exotic for that week, so how is it not "earning" it, even though I hate using that word for Destiny. If you wanna truly "earn" a weapon go do exotic bounties.