Hmmm. I'm sort of torn but based on the huge XP boost you get for doing events in a big group rather than alone, the fact that it does reset if you wait for 10 minutes, and the fact that you guys were essentially grinding them 3+ times apiece, I don't know if I object to DR in that situation.
Your last line, about how you've just been exploring a new area, finding where the events area, and haven't experienced any DR yet, that strikes me as the design working as intended
Whoa. Maybe I should quit exchanging gold for gems.