Interesting. This morning I did a quest in Howling Fjord to collect 3 frost chimera horns for those walrus people things. My main prolly took a good 13 kills or so to get all 3 drops and was the first to complete it, and the last two toons to get their drops both got all 3 within 3-4 kills. Ive done a few collection quests and did not really notice anything, but today it stood out and I just passed it off to good luck for not taking forever.