It is impossible for ideas to compete in the marketplace if no forum for their presentation is provided or available. This concept of finding out what your market wants and then going to create your product was refined by Japanese automobile manufacturers in the seventies and early eighties. After extensive market research, most Japanese automobile manufactures realized that American drivers wanted small fuel efficient automobiles. So they went and created the desired product and soon gained a foothold in the American automobile marketplace. The inability of American automobile manufacturers to find out what people wanted cost them a great loss of market share to their Japanese counterparts.
Publishing is no different.
Find out what many people demand and then provide the supply at a reasonable cost. Keep in mind that the information you want to sell does not have to be in demand by millions of people. What is important is that you market your publication properly to the few people that will be interested in it. These few people, however, must represent a economically viable group of people. These are the type of numbers that can produce a publishing fortune for yourself.