They should get rid of the chests and have the mobs drop more glimmer instead. I did some farming, and it quickly becomes tedious. Kill all mobs, check all chests, repeat. (well, killing is always fun) But it is also incredible cost-effective, since you get very little glimmer from killing or dismantling loot. Putting them on a longer timer will just cause people to fight over them, and start camping spawn points. If we absolutely must have them, they should be on a personal timer, and only visible to you. But I really think it is a mistake to have the money in the game spawn as a resource, at least in these amounts. So get rid of random chests, and increase the rewards. The one-off chests should stay, they are rewards for exploring.