I don't know much about conjoint analysis but I'm told by professional researchers that conjoint is the only way to estimate revenue potential to a feature. In the latest issue of The Pragmatic Marketer, Brett Jarvis writes,
Conjoint analysis is a set of market research techniques that measures the value the market places on each feature of your product and predicts the value of any combination of features. Conjoint analysis is, at its essence, all about features and trade-offs.
Read more in http://www.pragmaticmarketing.com/publications/magazine/8/2/conjoint-analysis-101