Libertarian party seems to be made up of people whose sole joy in life is getting Democrats elected just so they can rant that the Republicans shouldn't ignore them. Seems to me that it IS worth the effort to keep the lunacy from spreading.
The Libertarian party will never be significant enough to be anything more than a joke, but they COULD become significant enough to turn control of the country back to the Democrats by drawing enough conservatives to their side. Libertarians are as dangerous as the Democrats, IMO.