http://askem.net is a web site for marketing research.
There are two types of users: auditory and business. The auditory users are able to participate in the market researches based on their profile information.
The business users could create market researches and define criteria for the users who are allowed to participate. There is credit amount defined for each research participation. This credit is paid to the auditory user for his/her participation.
The main Drupal functionality of this site includes the integration of the webform, ubercart, userpoints, profile_content modules.
Special attention is paid to the proper "filtering" of the auditory users to the available market researches. The auditory user is allowed to participate only after he/she has completed the user profile to 100%, the profile criteria match the research criteria and others.
