At least that way they have some power. Secondly, there is the addictive quality of Hierarchy. Failure means they jump right in. Thus, as the mage falls deeper under the influence of the powers of hell, she finds it harder and harder to escape. As the mage continues to use Hierarchy, the infernal paradigm begins to subtly infect his surroundings.
Neighborhoods get meaner, pollution gets worse, etc.
To raise Hierarchy, the mage must spend current rating x 8. The storyteller, of course, can add to this list as he sees fit. Anders suggested granting infernal points for evil acts, especially those done either as part of a pact, or for an infernal master, and I think this is a great idea. Hierarchy may also be used in talisman construction and the creation of Horizon Realms. Talismans created thus will always be subtly cursed in some way, and Horizon Realms will be warped in disturbing and dangerous ways.