Libertarianism is very much a fringe ideology propped up by billionaires who find it useful to promote an ideology that justifies their refusal to give back to the society that made them rich.
"There are 609,234 voters registered as Libertarian in the 31 states that report Libertarian registration statistics and Washington, D.C." [0]
"Koch-funded think tank offers schools course in libertarianism." [1]
"Koch foundation proposal to college: Teach our curriculum, get millions."[2]
[0] https://en.wikipedia.org/wiki/Libertarian_Party_(United_Stat...
[1] https://publicintegrity.org/politics/koch-funded-think-tank-...
[2] https://publicintegrity.org/politics/koch-foundation-proposa...