During one of my internships, a guy talked about his career and specifically one job he had in the IT department of a big French TV channel. His team had a lot of turnover to the point that only him knew everything about the projects and how to make them work. In this context, he asked his boss for a raise and he said: "Cemeteries are filled with indispensable people".

Not if you own your own company. You’ll always be the founder/president and own your ip even if you have no customers.