Dungeons - nothing to offer

[Synthesis]

There are plenty dungeons in game which drop 100 % armors, alright let i be like that. Why not.

High lvl dungeons drop 60 ilvl sure, why not. Now new dungeons will drop i70 alright.
But that is all ? We have no motivation to run it more than once. And then twice a week for the rest of tombstones.

Why not to add some extra chests with no 100 % drop rate, I mean rate could be low and it could provide variety of items.

- craft material (extra parts, for extra recipes, gear or even vanity, etc.)
rate* collect more of those parts to be able to craft a recipe
- materias (various tiers)
- other interesting things
- few *500-1000 gil, etc. (it was there once)
all with :: low drop rate

why there isn't any motivation left to run those dungeons. None at all.
Dungeons should change in some way, because they're boring the way they are - nothing for high lvl players. Add some extra stuff with no 100% drop rate to make it a bit more interesting. Why not ?
Feel free to post any other ideas and Excuse my English.