According to Osho, few are interested because spirituality is uncaused and entirely voluntary: no hunger-like compulsion drives you to transform. Most people live under causality—body, culture, mind, and a scientific outlook—so they wait for conditions or authorities to 'cause' awakening. Only those who claim their innate freedom choose, here and now, to transmute inner heat into light.
No one makes you be spiritual; you must choose it yourself, but most people keep waiting for something outside to push them, so they never start.