> if you register for a trial, for example, you should be "paying" with your email to let the company start a marketing process. I know where you are coming fr

> if you register for a trial, for example, you should be "paying" with your email to let the company start a marketing process. I know where you are coming from, but I don't think I've ever heard it said this way. Do you have any resources that talk about free trials or fremium in these terms? Is the value in that email mostly in the ability to market to the individual behind it, or is the value only in its ability to be sold and/or cross-advertised to? Personally I would say that any user who didn't sign up is "worthless" (given the context you are using here), whether they gave you a disposable email address or not.