There is a correlation between the success of a product/service and the difficulty of the technical problem you solved to create the product/service. There are

There is a correlation between the success of a product/service and the difficulty of the technical problem you solved to create the product/service. There are hard technical problems that don't result in profitable products and there are profitable businesses that result from non-difficult problems. But there are several examples of companies which solved super-hard problems (e.g. PageRank and Google, Blackberry and messaging, Apple's UIs, TI-Intel-etc.'s transistors and ICs, IBM's early mechanical computers, Edison's invention of the light bulb, Ford's assembly lines, etc. etc.) I think the mistake many people make is that they treat marketing as a problem divorced from technical development. They should really be the two sides of the same coin. It is wimpy and inexcusable for entrepreneurs to say "I'm good at one and not the other".