User blog comment:DBard/Magicians/@comment-1359322-20120618035415

“Yes. Magicians summon devils, and they make a pact along with a price. We just lend our powers when necessary. The ritual is a bit different from the one where we grant the wish of normal human. It’s normal for the famous devils to be summoned, but Young devils also receive such offers.”

The Magicians use the Devils power to determine their status. Then for the Devils, their status in the society is based on the number of contracts, Rating Games and achievements, meaning if they get more contract it is good for them. So everytime a Magician calls them for help they get an additional contract.