According to Osho, there is no hidden "trade secret"—only an open secret: uncompromising authenticity. He speaks the truth as he sees it, fearlessly, without bowing to vested interests, and accepts every consequence as a reward. He refuses to compromise even if the whole world opposes him, fighting tooth and nail for his truth and living entirely according to himself.
His secret is just telling the truth bravely and never bending to please others, no matter what happens.