The investment cost of a private home theater varied by region and size. In small cities or second and third-tier cities, a private theater with three to eight private rooms would cost about 500,000 to 600,000 RMB, including rent. In big cities or first-tier cities, a private theater with 12 private rooms would cost about 1.3 million yuan, including rent. Other than that, there were other expenses such as renovation, equipment, and labor costs that needed to be considered. According to the information provided, the total investment for a private theater was between 400,000 to 800,000 RMB. However, the specific investment costs needed to be calculated in detail according to the actual situation.