(a) In setting the amounts of the fees for entering, reserving, or using a historic site described by Subchapter C, the commission:
(1) shall establish reasonable and necessary fees for the administration of commission programs; and
(2) may not set fees in amounts that permit the commission to maintain unnecessary fund balances.
(b) The commission may sell any item in the possession of the commission in which the state has title, or acquire and resell items if a profit can be made, to provide funding for programs administered by the commission.

(c) The commission may set and charge a fee for the use of a credit card to pay a fee imposed by the commission in an amount reasonable and necessary to reimburse the commission for the costs involved in the use of the card.