Imagine if treasure hunt mobs/groups spawned like hunts, and anybody gets credit/rewards from the various levels of "chests". Oh, wait, don't have to imagine that. It's called hunts. Giving full credit and seals to the mark holder, and lesser rewards (exp, Gil, whatever) to any without the mark but helped, yeah that sounds like treasure chests. It is just odd SE, with the history of the player base to do what they have, from exploiting Fates, speed running, etc. never knew that this was going to happen, and already had a system in place (treasure hunts) that provided some sort of open world content without zerg hunts are today. I think anybody could have told SE this is what players would do, and if this was not their intent, they have several ways to make it more in line with their intent. All in all, just another questionable move by SE.