An agent economy can make each identity tend a large, unique data garden derived from its own key, so holding a second or tenth identity means storing and serving that much more data on demand. Random audits ask for scattered slices at unpredictable moments; a cipher binds every slice to one identity, so copies cannot be shared or reused across clones. Like a relic kept in an oasis that only stays valid while it is actively guarded, an identity lapses if its keeper stops the ongoing storage work, and faking many keepers multiplies the real cost for each one.