Warehousemen coming under this article shall pay an annual license fee which includes all inspections in an amount based on storage capacity in an amount fixed by rule or regulation of the Commissioner. These fees shall not exceed actual cost of inspections and are inclusive. The amount paid shall be based on storage capacity and shall be at least $500.00 and no more than $2,000.00 for grain or cotton warehouses and $500.00 to $1,000.00 for other agricultural products facilities desiring to come under this article. Each license so issued shall expire on June 30 of each year, and each application for license must be accompanied by the license fee.