I'm reminded of a run where a 3-man premade griped at me the whole run about how i mark targets.

I shield lob, and that marks my primary target. When that is close to dead, I'll mark something else with 1 so DPS know what to attack next. I never pause to mark, I never forget to mark, single target dps know what target they can expect to stay glued to me (even if I've tabbed to something else for a minute). (Everything stays glued to me, but it's easier to hold hate off a summoner's Bane than it is with a drg attacking some target at 90%).

I just...flat rewards are better than this. Give people 10 additional myth when the dungeon has at least 2/4 pugged (so two pair-groups would qualify) and let this break the myth cap. That's how you entice people to use duty finder. Make this apply to a level 50 queuing for "Any random dungeon", so if you end up in Brayflox, you still get 10 myth bonus.