Why is Unicom's point-to-point SMS fee so expensive?

The increase of network maintenance and management costs. The reason why Unicom's point-to-point SMS fee is so expensive is mainly due to the increase in network maintenance and management costs. China Unicom should establish and maintain a stable network, such as establishing a network and server, establishing a short message routing system, supporting the sending and receiving of short messages, paying the fees of network operators, and maintaining the personnel and work expenses of the network, which will greatly increase the cost of China Unicom. In addition, China Unicom has to pay the cost of SMS service providers and the cost of sending and receiving SMS, which will greatly increase the cost of China Unicom. That's why Unicom's point-to-point SMS fee is so expensive.