Most people are naysayers, they believe in a pessimistic universe and make choices accordingly. They will follow the herd where ever it goes. For the most part

Most people are naysayers, they believe in a pessimistic universe and make choices accordingly. They will follow the herd where ever it goes. For the most part all you can do is convince them that the herd is going that way. You will never radically change their opinion. Ignore them and don't worry about it, spend time finding people who are ready to embrace whatever you are doing. If you want to find out about convincing people, learn about rhetoric and learn about posturing (body language). Ensure that your body language matches your rhetoric and you will convince most of those that can be convinced. Spend time listening to what they are saying and change your pitch to reflect what they are saying. Understand their problems and show them how your product can help them. When speaking to a single person do not worry whether your product can help 10,000 other people worry about solving THEIR problem. If you can't convince people of the greatness of your idea perhaps it is time to consider whether the idea is great in the first place. Your idea should be good enough that you can get them to sign a letter of intent to purchase conditional upon the product doing what you said it would do for them. If the iPhone was a great idea, the Newton should have been the greatest idea since the wheel, but it was a shitty idea because it was 15 years ahead of the infrastructure required to make it useful. (3G internet / Facebook / Twitter / etc)