Which of the following is NOT a valid criteria for determining reasonable fiduciary fees?

Determining reasonable fiduciary fees involves evaluating several criteria that assess the fairness and appropriateness of the charges associated with fiduciary services. Among the aspects considered, the necessity of the service establishes whether the service provided is essential and justifies the fee. Education and expertise relate to the qualifications of the fiduciary, highlighting the value they bring based on their training and experience, which can influence fee determination. Time taken to complete the service accounts for the effort and hours invested, which directly correlates with the complexity and labor involved in fulfilling fiduciary duties.

In contrast, the expensiveness of the service as a standalone criterion does not necessarily indicate reasonableness in fiduciary fees. Fees should be aligned with the value of the service provided rather than simply reflecting high costs that may not correspond to the quality or necessity of the service. As a result, the expensiveness of the service does not serve as a valid measure in establishing reasonable fiduciary fees, making it the correct answer to the question.