Recently Erik and Katya were talking about how great monthly revenue is as opposed to the other means of billing clients like hourly or project-based.
Before starting with monthly recurring revenue, Kevin and Erik had no way of projecting out to the future. When they were working on projects, at some point it would go down to 0 eventually but your expenses continue to increase because you have all these people working for you and expecting a raise.
Recurring revenue gives you the ability to track how much revenue you get each month and you can then project out into the future. With recurring revenue, you can plan, budget, forecast, and see into the future.