How can Buddha and Mahavira's sannyas be associated with sorrow despite their affluent backgrounds?

According to Osho, Buddha and Mahavira did not embrace sannyas out of misery but from satiation—an ennui born of abundant happiness that felt meaningless. They renounced worldly happiness to seek a higher fulfillment—bliss. Later, masochistic interpreters projected their own suffering onto this stance, equating renunciation with sorrow, thus linking these affluent sages’ sannyas to pain despite its origin in plenitude.