These situations arise whenever you introduce area specific or boss specific item drops into a loot based dungeon crawler. As long as there is an area with higher drop rates of desireable items that is efficiently farmable, that's where they will spend their time. This is why whenever we discuss the drop rates of something like the Mark of Sin and the stock answer is "you'll have a better chance to get it if you farm uber Diablo or the Diablo clone" I just have to shake my head. People farm time rift diablo for a reason. It's relatively efficient and you have a chance at getting boss specific items along with ilvl 87+ gear as well. Farming keys for Uber's won't do this for you. You're better off trading the gear and/or runes that you find farming the time rift with someone who has been using an exploit that stockpile anni charms Since that's how we roll here apparently.