Test Marketing

Build a few products or provide the service at your planned price to a few strangers. Remember, most of your customers will be strangers, not friends.  How many people that you tried to market to did not buy and why?  What did the purchasers have in common?  This is a reality test. Review all the above steps to improve the results if you can. 

If nobody wants the product at a price you can afford to produce and sell it, you do not have a business.