Statistically, a thousand people is representative of any opinion and attitude. What seems to work well with smaller numbers is a clear intent to purchase the product and better yet, actual customers or beta testers. So in other words, if through a Kickstarter or similar small marketing campaign you get actual revenue going, this is almost better than positive confirmation of need by a larger sample population. Key is to get niche right and to focus on competitive advantage. Hop on a call and we can confirm your progress, plan for success.