The Last Conformist
Irresistibly Attractive
I've not heard that it did. King Philip of Macedon consulted the oracle in Delphi in the 330s BC, and Plutarch - a rich and influential man - saw it as a great honour to serve as a priest in Delphi in the 1st C AD. He's written what I think is the only eye-witness account of the practices of the oracle.