The commissioners court may set and collect the fees in different amounts or may waive the fees in consideration of the following factors:
(1) the time of the day at which or the day of the week on which a facility or service is used;
(2) the size of a group wishing to use a facility or service;
(3) the special circumstances of certain classes of persons, including elderly persons and indigent persons; or
(4) other factors that the court considers to justify a different fee or the waiver of a fee.