Ag bis (if I may greet thus so informally!) has nailed the reason that NUMEROUS companies fail to implement change. Irrespective of whether a bonus directly relates to a change, the all powerful 'annual performance review' ensures that managers thrive by keeping things to themself and bragging to get an improved report and, consequently, annual raise.
Yet, if they accepted a good suggestion, they would get all the credit for implementing it and building the trust and confidence of a member of their staff. simples! If only modern business worked that way ...