I think this must be true of software, too; I have thought, from time to time, "that'd be neat, but there's no way I could sell it", or even just "that'd be neat, but nobody else would want to contribute" (for FOSS). But... the same logic would imply that a lot of things shouldn't exist that do. Why do any of the BSDs exist, why does redox exist, why are there so many programming languages, why are there so many package managers, ... maybe, if I think it's neat enough to build, other people would want to use it. Maybe, if I would pay for it (if only someone would sell it), others would, too.