CPALead is a CPA service (Cost per Action) which allows people to
install a survey "gateway" on your site. When a user lands on your
site and completes a survey, you make money and they get access to
your premium content.

The average payout for a survey is between $0.75 and $1.25, with some
as high as $10+ and some lower than $.30. Many people see CPALead as
a very reasonable alternative to a PPC program such as Google Adsense,
and some even use it in conjunction with other advertisers to maximize
their revenues.

Making a person fill out a survey is not very difficult. The key is
in having content that is in demand enough that it's worth someone's
5-10 minutes in order to get access. Many people use the gateways on
movie sites, tv show sites, e-book sites, and many other sites with
premium content.