Great advice. The problem with just blindly collecting emails is that you may be able to accumulate a bunch of emails passively. But by the time you release the product and email all those folks, the conversion rate of people reading your email, and caring will be dreadfully low.<p>On the other hand, if you have a conversation with them, and get their feedback, and make them feel like their ideas will help make the product better, more people will be interested in trying out your product. Sure, it's not as scalable, but you're gonna attract more quality users, and those users will be the same people who will go out and tell others about your product.<p>You get more validation, more feedback, and more ideas on what critical features to implement. Just getting email addresses is not as effective.