Someone who sells themselves into perpetual servitude is a slave. Such slavery is forbidden by the 13th Amendment, but is consistent with Libertarianism and its mutations. Such slavery is forbidden by the 13th Amendment, but is consistent with Libertarianism and its mutations.
servitude: State of subjection to an owner or master or forced labor imposed as punishment
subjection: 1) Forced submission to control by others 2) The act of conquering
To the best of my knowledge perpetual servitude is inconsistent with the Libertarian platform.
I don't trust you not to make up your own mutations so just provide the quote and URL from the Libertarian platform that supports your argument that perpetual servitude is consistent with the Libertarian platform.
Main Entry: ser·vi·tude
Pronunciation: 's&r-v&-"tüd, -"tyüd
Function: noun
Etymology: Middle English, from Middle French, from Latin servitudo slavery, from servus slave
Date: 15th century
1 : a condition in which one lacks liberty especially to determine one's course of action or way of life
Merriam-Webster Online, http://www.m-w.com