The other items were also the same.
Treasures that really contained powerful energy, even their cores would be extremely valuable. Even if all the energy was drawn out, the remaining materials were still extremely precious and could be auctioned off at a sky-high price.
For example, the Spacial Sky Crystal was the most precious space treasure that was extremely powerful. The amount of spatial energy contained in the Spacial Sky Crystal, the size of one's nail, was as much as tens of carriages of Time Sand! After drawing out all of the power of space from within, the Spacial Sky Crystal would become Sky Crystal. The Sky Crystal was the hardest diamond in The New Age, it was a rare and precious material that could forge Legendary items.