I support this idea. Not that I think I would do it. But more options. They could even add an option when running the dungeon to increase the difficultly like they do with leves. Imagine if you will increating all mob HP by 200%, etc.

Rewards could be better, or the same, it doesn't matter. But there could be cool unique titles, and other things that players could shoot for.

I'm all for more options.