I commented recently on two separate blog posts which touched on a common theme: "Should I use a squeeze form/popup on my website?" (Using the squeeze form before any additional information is shown.)
This question gets asked for two reasons, generally. One, the site owner/designer is concerned that their visitors will be put off by the form/popup and will leave the site. This is certainly a concern, as I know many people who will do just that. And the proliferation of pop-up/ad/image blocker plug-ins for web browsers shows that this is not an isolated sentiment.