Which innovative 'customer engagement' strategy did the Oracle of Delphi employ to maintain its prestigious brand reputation across the ancient world?

The ancient world's mythological sites and figures weren't just spiritual centers—they were also early examples of branding and customer engagement. The Oracle of Delphi, perhaps the most famous prophetic site in ancient Greece, employed fascinating strategies to maintain its reputation and 'customer loyalty' across centuries. This poll explores how this ancient institution marketed itself in ways that modern brands might recognize.

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Creating ambiguous prophecies that could be interpreted multiple ways, ensuring 'customer satisfaction' regardless of outcomes
Offering a loyalty program where repeat visitors received copper tokens exchangeable for priority consultation access
Publishing quarterly scrolls featuring successful prophecies, distributed to major Mediterranean cities as testimonials
Developing a distinctive visual identity with standardized temple architecture that was franchised across Greek colonies