I know MANY libertarians who don't often vote Libertarian.
@Suppressed Speaking as one such libertarian, I
was a registered Libertarian once upon a time . . . until the late Harry Browne turned out to be trying to maneuver the national party to bag their presidential nomination a second time with tactics that might have made even a Chicago machine politician blush. The fact that what he was doing violated formal LP rules against allocating party resources and monies to a candidate
before they received the formal party nomination actually seemed not to bother a lot of the LP leadership at the time, to the point where they actually barred
Liberty, the libertarian journal, from LP functions while the magazine investigated those doings and undoings.
I changed my registration to independent right then and there. (I had no wish to return to a Republican Party that, at the time, was abetting the GWB/Republican Congress drunken-sailor binges and such floutings of the Constitution as too much of the Patriot Act, McCain-Feingold, and others.) As an economic thinker Harry Browne was gifted; as a politician, he turned out to be just another machinist, God rest his soul.