Total revenue works by seeing what price point a user signs up at, and totalling that with the signups at various price points. For example, if you had 10 users sign up at your $50 price point, and 5 users sign up at your $100 price point, your total revenue would be $500 + $500, or $1,000. The longer your product site stays up, the more confident you can be in the revenue numbers. Note: Since users aren't inputting payment information, a portion of your users would natually fall off during the real checkout process. However, that number is typically consistent across all products.