I think if we know for sure that a new service or purchase will generate more money, we shouldn't think about how much it costs. For example, I started using the services of TMC (Australia) for over a year, and with their help, my profit increased by 30%. I know you might think it is a lie, but the answering services made me lose less time talking with clients and explaining everything, made me focus better, and cleared time for more clients, which is insane. With only one client, I can pay their monthly fee.