If you care about actually making money from the very beginning (as opposed to just being bought -- which isn't likely to happen -- or just getting a tonne of u

If you care about actually making money from the very beginning (as opposed to just being bought -- which isn't likely to happen -- or just getting a tonne of users and worrying about it later), then consider your business model at the very beginning. Changes or problems with either your product or business model can significantly affect the other, so if you can focus on both from the very beginning, I can't think of many reasons why you wouldn't.