This will be pretty short but think about it for a second... Most exotics in destiny you can pretty much get from xur mean while there are rare items I am yet to get because they drop at random and cannot be bought hence make them rare in since cases.
I'm not trying to turn this into any thing but don't you guys find it funny that some items in game with the exotic title are more common then rare items because you can get them with strange coins once a week?
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Why would you try to go for rare weapons if you're level 32?