Instead of doing Shadow Lairs everyday or when you get the chance to repetitively, why not add 3 more lairs if not 2 to the clockworks (based on new depth levels, better gear enhancement system, and difficulty rate).

Crystal Lair (my idea)
Radiant Lair (my idea)
Cosmos (my idea)

Shadow Lair - You get enough money, more heating crystals, and unique materials - 1,800 CE (for a key + 3 depths)
Crystal Lair - You get more money than enough, heating crystals, and unique materials - 3,600 CE (for a key + 4 depths)
Cosmos - enormous or large extent of money, heating crystals, new enhancement (for 5* gear) materials - 5,000 CE (for a key + 6 depths)

This will not make sense and I'm looking forward on typing an essay of ideas that are sensible (with pictures, drawings, etc). This is just one of my ideas not explained or examined properly.