No, for most owners the math would argue against it. Running a captive well requires nine specialized trades: captive management, accounting, actuarial, legal & tax, fronting & reinsurance, claims, investments, advisory, and regulatory compliance. Even a senior insurance professional would be unlikely to possess the expertise to cover each of these tradecrafts on their own. One or more salaried positions would be hard to justify, especially at the start of a program. A full-service manager like Luzern delivers an entire department for a predictable flat rate, which is why even companies with sophisticated finance teams typically outsource the function.
Another reason for using a captive manager instead of an in-house team is continuity. A department of one or two means the program's knowledge lives in individuals who can retire, leave, or get promoted, and rebuilding that expertise mid-program is expensive and slow. A manager solves the key-person problem structurally: the team, the records, and the workflows persist across organization changes. Your team's role stays strategic, setting direction and owning results, while the operating load sits with a partner built to carry it.