AI investments will face a critical problem of return from huge investments. We all enjoy free AI services at this moment. However, there will be charges for AI services (agents) by the volume of Tokens. When the demand of AI agents is not high enough, the unit price of token will become high. Lots of reports have found too high costs of AI agents which consumed too many tokens. If we cannot save money for businesses, AI investments will leave. Once AI killed lots of jobs, who could buy AI products?