Perhaps a brother has made mistakes in the past, and now he feels that he is not worthy of being a ministerial servant or an elder. Another brother might have feelings of inadequacy about fulfilling an assignment.
Or maybe instead of placing blame on the brother they should admit that nepotism and money are involved. If they want you in their boys club you will be admitted no matter what sins you practice or how inadequate you are. If they do not want you in their club, no matter how christian and righteous you are and no matter how qualified you are you will NEVER be admitted.