I know of no case where a guru has "retired" or renounced his position.  Not a single one.

Krishnamurti comes the closest but he spent the last years of his life speaking to spiritual seekers about the path to true wisdom while enjoying all the benefits of gurudom.  He personified all the usual hypocrisies, including an affair with a married woman which he tried to keep secret.

Instead of coming clean about their fraudulent ways, gurus invariably play the part until the very end, and their idiot followers continue on after that!  No matter how bad it gets in terms of dwindling power and appeal, they keep up the charade with whomever will follow along.  And we all know what happens when it gets real bad - murder and suicide.  Many gurus do end quite badly.