The point is that it sounds like they untimately want to be an "independent" nation.
If you read their site, it might help. Their goal is to concentrate enough liberty-minded people in one place, that they would be able to make a difference in the government and secure electoral votes.

The reason it is happening is because some Libertarians are getting fed up with how sparsely distributed they are, and they realize that they could better serve the cause of freedom if they concentrated their efforts. They are not proposing secession.