 In the book "Underboss", Gravano estimated that Gotti himself had an annual income of not less than $5 million during his years as boss, and more likely between $10 and $12 million.To protect himself legally, Gotti banned members of the Gambino family from accepting plea bargains that acknowledged the existence of the organization.He maintained a genial public image in an attempt to play down press releases that depicted him as a ruthless mobster.