In a promotion review, being able to say my project drove $X in revenue wins almost every time against any other metric. It's easy to state and directly relates to the companies business goals.
But customer demand is only useful if you can turn the demand into a sale and a happy customer. Measuring the conversion of an interested user to a customer is how you measure return on investment for features.
If what you did meant an increase in revenue from those customers, then it is fair to say it drove revenue.