Charge a monthly or annual fee to offer members access to exclusive advice or products. Sell your expertise through exclusive podcasts, offering live FAQ sessions through Skype, or forums. You may want to try selling a monthly subscription to allow users to sample new products, similar to a book club. Frequent interaction increases interest and helps build membership through word-of-mouth.
Residual income is calculated as net income less a charge for the cost of capital. The charge is known as the equity charge and is calculated as the value of equity capital multiplied by the cost of equity or the required rate of return on equity. Given the opportunity cost of equity, a company can have positive net income but negative residual income.