After doing it a few times, we got a 3200~ as our highest with 30 anima return, wothless DM drops, and a few stray Ixali currency. I don't have a screenshot so you'll just have to take me at my word.

We didn't have one of the 'top 20 contributors', but we did utilize DoL/DoH buffs (which help a lot!) Having your WHM's heal the NPC's is also very, very helpful. I'm not sure if you lose points for this (we never let them die), but the mobs can definitely overrun you when there are less NPCs to help.

I'm wondering if running with one of the 'top 20 contributors' will result in actual gear drops as I haven't met anyone who's gotten a drop yet.