The Mercenary Business Was Part of the Strategy
SPOILER!
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Cheap Contracts · Revenue · Undercut the Hidden Villages
Akatsuki takes paid work because money and reputation are part of Nagato's road to political power. A small organization of elite missing-nin can accept dangerous jobs without maintaining a village, civilian population or national bureaucracy. That lets Akatsuki build funds while also competing with the institutions it ultimately intends to make obsolete.
Why it worked
The members do not need to share Nagato's philosophy for the business model to function. Kakuzu can care about money, Hidan can care about Jashin, Deidara can care about art, and the organization can still turn their private motives into useful labor.
Hidan & Kakuzu: The Zombie Combo
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Immortality · Money · Constant Hostility · Abilities That Survive Friendly Fire
Hidan and Kakuzu openly irritate each other, but their pairing solves a practical problem. Kakuzu has a history of killing partners when angered. Hidan cannot be killed through ordinary physical damage. Hidan's ritual fighting style is reckless and requires time and blood; Kakuzu supplies ranged pressure, multiple elemental attacks and the experience to keep a larger battle under control.
Why it worked
Their personalities are a terrible match and their bodies are a remarkably good one. Akatsuki does not solve their hostility. It gives that hostility a partnership sturdy enough to survive it.