Tiered Difficulty Runs

It would be great to have different level of difficulties on runs in the Playa, that give you more/and better ore the harder the difficulty. Something like Easy/Medium/Hard (easy being current dungeons). Once you get to the good equipement, runs feel very easy and even slightly boring. This could add more intensity to the Playa for those that are ready for it, or add a gamble mechanic for those that are less strong but want to see if they can get better ore.