Pollground has a good concept that definitely has a market somewhere, but I’m not sure their implementation is ideal. Psychologists, for example, are big users of online surveys. They would pay for better tools to generate and score their surveys. It looks like Pollground are going the ‘on-line billboard’ route, intending to rely on advertising, but it is really too early to say what their strategy is.
One problem with online surveys — it is open to abuse. To their credit Pollground haven’t yanked it (yet). Cover-ups never work on the Internet.