Until you have tried it, don't knock it. They have actually done it and have demonstrable success. You comment on blogs to engage the existing early adopters o

Until you have tried it, don't knock it. They have actually done it and have demonstrable success. You comment on blogs to engage the existing early adopters of the niche you are targeting to start the process of customer development. You hit up friends to practice pitching (don't underestimate this) and getting some up front feedback on the cheap to help refine your idea.