I belong to a hunt linkshell that specializes in spawning S ranks. To be honest I was starting to feel really bad for the spawners (and some are pretty difficult to spawn) when it was getting difficult to get a full party together to take them down. The rewards and relic have changed that to say the least.

Perhaps a concept like the OP is after would work pretty well in something like diadem. As it is now if your party doesn't do enough damage they don't get a chest. It might also prevent the mass zerging that takes place there. Diadem could have been a lot more than it is now and I thought the idea of higher difficulty hunts/mobs was the purpose of that duty to begin with. I know I didn't envision having an environment where 5 parties sat in one spot and did nothing but kill the same hunts.