In a flat world we live today we have lots of opportunities of leveraging the collaboration tools to start bootstrapping a business with very little or no cash.
More than that, one has a unique chance to see the response for his potential service or product before actually making or developing one. Thanks to such instruments as Google AdWords it is possible to accurately measure a feedback, that potential product or service can get, over a short timeframe and then extrapolate it.
This gives priceless insights on how people react on the offering. Is it worth going this path further, creating concepts, alpha and beta versions? Or maybe one just should stop where he stands, pivot and dedicate his energy to something more promising.