Obviously your person anecdote is not representative of everyone. I suspect some Libertarians would like to have a representative in DC, and the poll numbers suggest that they should.
Then they're going to have to concentrate their efforts to winning in a single congressional district which is the smallest Federal political subdivision. I mentioned our own case because if it could be done it should be able to get done here, one of the "Greenest" "Libertarian-est" cities in the country; we are more than tolerant of the novel here. We're not known as "San Francisco East" for nothing. These two ideas, though strongly felt by a minority, don't have the cache to win a house seat....as of yet. Keep trying, is all I can offer to you. I can offer you one other suggestion: read "The True Believer" by Eric Hoffer. It might shed some light on the mind of the "true believer" through history. For the Constitutional issues involved, one need only read the US Constitution.
So what is the plan? Have all the Libertarians in the state move to that district?