Nice site. Clear goals.
One suggestion:
Why limit at 50 responses?
What if I want more than 50 people to participate in the survey/market research? Can I setup something? It wasn't obvious from the web site.
1) Free, limited number of responses (maybe 5/month?), ad supported.
2) $5, Unlimited number of responses, no ads.
3) Skinable version for companies, allows them to manage questions/responses asked by employees.
We found that 50 responses offers a good set of opinions without taking too long to finish. What are some other options you'd like to see?