The only items "earned" in Destiny are items with specific criteria for attaining them. Such as exotic bounties, Iron Banner gear, Murmur etc ... Everything else is dropped by a programming algorithm, otherwise known as "luck". Case in point. I have played almost 400 hours and have beaten both Raids repeatedly as well as lots of Nightfalls and I've never gotten a Gjallerhorn. I barely play PvP and scored a Suros off a random match reward. No rhyme or reason. Just "luck". If you think you "earned" a random drop, get off your high horse and join reality with the rest of us.