Ilya Somin at theVolokh Conspiracy presuasively argues that the Libertarian party is a failure and doesn’t deserve our time or money. He writes:
Libertarians have had some genuine successes over the last 35 years. These include abolition of the draft (heavily influenced by Milton Friedman’s ideas), deregulation of large portions of the economy (of which libertarians were the leading intellectual advocates), major reductions in tax rates (facilitated by libertarian economists, libertarian activists, and the legislative efforts of libertarian-leaning Republicans), the increasing popularity of school choice programs, increases in judicial protection for property rights, gun rights, and economic liberties (thanks in large part to advocacy by libertarian legal activists), and heightened respect for privacy and freedom of speech (promoted by libertarians in cooperation with other groups). Libertarian academics and intellectuals have also done much to make libertarian ideas more respectable and less marginal than they were in the 1960s and early 70s.
What all these successes have in common is that they were achieved either by working within the two major parties or by efforts outside the context of party politics altogether. The Libertarian Party didn’t play a significant role in any of them.
Libertarians often emphasize that failed enterprises should be liquidated rather than kept going on artificial life support. That enables their resources to be reinvested in other, more successful firms. The point is well taken, and it applies to the Libertarian Party itself. For 35 years, the Party has consumed valuable resources, both financial and human. The money spent on the LP and the time donated by its committed activists could do a lot more to promote libertarianism if used in other ways.