Sorry, but this is just not true. Its a matter of luck. One friend who was has been super lucky all along on bm runs has been dry for 2 weeks. Another just got his first pink since expansion, and he was very lucky during ichnor quests. I got a few pinks when expansion started then nothing til yesterday. I got 4 pinks after playing same alt all day long. As others have said, you have to put the time in.
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