I did this a couple of times with large parties, and the loot is really bad with anything other than a small crush team. Because there's not very much loot, the good stuff is in crates, not monsters, and the crates have small numbers of things.
It's got occasional amazing loot and a guaranteed relic, but what this tends to mean is one person gets a valuable thing and everyone else gets a few bits of junk. A couple of supply crates and/or a gold pile would mean this quest isn't a supply sink, or a reason to OC refuse characters because you know it would just be an overall loss.