"My Sister Wants Court Wedding, But Her Husband Doesn't"

Her husband is vehemently against having a court marriage with her, They did church marriage and reception but no court,

He keeps refusing and saying he doesn't see the need because he isn't travelling abroad soon and so does not see the importance.

Please what is the usefulness of court marriage for her as a wife and him as the husband? I want to know how to advise her in convincing the husband.