Oh no. American liberty, whether the L is capitalized or not, is NOT the liberty of the common man to infringe on the property rights of the rich(*). Police and regulatory power for that will only increase in their Utopia. If you’re looking for the money savings in libertarian government, that comes from removed support for the non-property rights of the common man: no money for public beaches, parks and forests; no welfare; relieving businesses of onerous employee safety standards; etc.
(* - One of them will chirp in to inform us that the property rights of the poor are also protected in Libertarianism 
Like Marie “Let them eat cake” Antoinette, that the poor lack property seems not to occur to them!)
If you deduce from this train of thought that real-world Libertarianism is not so different from the Fascism of, say, Pinochet’s Chile, congratulations! You probably now understand Libertarianism better than these so-called “Libertarians” do.