I was wondering if anyone here has tried using a content gateway to monetize their websites. If you're not familiar, a gateway essentially blocks the visitor from accessing content on a page until they "unlock" the gateway by completing a survey or other short-form offer.

We recently launched a content gateway at our affiliate network (Adscend Media). Here's the demo so that you can see how one works:
Gateway Demo - Monetize Your Content

I'll let you imagine the different types of content that it can monetize, but essentially if you can bring targetted traffic to a page, and offer them exactly what they're looking for, they're very likelywilling to complete a survey to access it.

You can also make the gateway optional by providing a Close button, so that it's similar to a floating ad.

There are different gateway scripts out there that I've seen people using, but they have a shortcoming in that they can't determine whether the survey was actually completed or not. They simply unlock the gateway after X number of seconds. Since we're a network, ours plugs in to our database and ensures that visitors are generating revenue. (There are also a few other networks that have gateway solutions.)

If you've tried them, what has your experience been? If you haven't, I can answer your questions. It's definitely a powerful technique.