The company earns. A multiple is applied to those earnings. That gives you a value.
But a potential buyer looks at the company slightly differently. What they want to know is: how much of all this remains once the current owner leaves? That is often where the uncomfortable part of the conversation starts.
For years that was precisely the strength of the business. The owner was fast. They knew the market. Customers trusted them. They knew almost every detail of the operation. But from a buyer's perspective it can look entirely different. If customers, knowledge and the key decisions leave with the owner, then part of the value is not in the company. It sits with the owner who is leaving.