My guess is that this is Gilt's model. To them the cost of users like you navigating away (perhaps without entering your email address) is smaller than the bene

My guess is that this is Gilt's model. To them the cost of users like you navigating away (perhaps without entering your email address) is smaller than the benefit they get from getting people who wouldn't otherwise enter their email addresses to do so. It's a business tactic that arguably prioritizes conversions and bottom line over general user experience. Commonly done but dubious when it comes to whether it is good for the end user.