I get what you're saying, I do. However, people will always find the fastest route to gaining <X currency>. Even if the last boss only gave 20 Myth, and then 2 Chest gave 5 myth. People would do one or two things. They'd find the best way to skip the trash then grab the chest, or they'd just continue on as getting 20 would be faster then grabbing that extra ten. I don't do dungeons because I really enjoy them. I mean sure a few times after they first come out, but then it just becomes "How can I get through this as fast as possible so my brain doesn't hurt?"