The document discusses the return on investment (ROI) of various activities and compares the ROI for average people to famous successful people who monetized those activities. It notes that while hobbies may earn some people only a small amount of money, celebrities and influencers have been able to turn activities like playing basketball, making YouTube videos, taking photos, or posting cat photos into multi-million dollar careers through platforms like social media. The key point is that the ROI depends not on the tool or activity itself, but on the skill and talent of the person using it to connect with an audience at scale.