Did you ever wonder why there are so many “Introduction to Libertarianism” books

Did you ever wonder why there are so many “Introduction to Libertarianism” books, articles, pamphlets and posts, but so few authors of any academic substance – other than Hayek? Mises is a classical liberal and a pseudoscientist. Rothbard is a pseudorational, postmodern propagandist. Hans is an innovator but dependent upon justificationary a priorism. We have David Friedmans pragmatic view. Nozic’s attack against Rawls, with no solution offered. We have no solution to moral differences. Nothing much exists because we have nothing new to develop. So all our works are merely inspirational. None scientific. And none proposing institutional solutions to moral diversity.