There are 4 ways to delivery Keynotes by Entrepreneurs:
Brochure Keynote speaker: These speakers will speak about their services and offerings to the extent that the audience may perceive it as if they are reading the companies brochure
Impromptu Keynote Speakers: These speakers would get on to the stage and share the latest insights from the podium. Though their primary purpose of speaking is to create their brand awareness.
Insightful Keynote Speakers: These speakers share their key insights from the stage without talking much about their own brand. They usually represent the Industry and deliver their speech from that mindset
Professional Keynote Speakers: These speakers understand the importance of keynote speech and the impact that it can create. Hence they masterfully craft their speech to create maximum impact. They craft their keynote professionally and hence charge a professional fee to deliver it. Famous entrepreneurs are usually associated with leading speaker bureaus which are contacted by leading conference organizers.
Do let me know for any query as comment and I will be glad to answer the same.