How kind of you! You compensate them for the fact that a) they bought people and b) they forced these people to work for them through torture?
The people who advocated "compensated emancipation" generally did so not out of sympathy for slave owners, but rather because they thought it was the only way they could get slaves emancipated.
Now, I know that there has not been a single political post of Cinnamon's that has demonstrated a grasp or knowledge of anything, it is worth pointing out once and for all that libertarians don't support slavery.
Libertarianism's and property rights in general philosophical basis is John Locke's bullshit argument that
since people owned themselves and when they originally acquired property they mixed part of themselves (their labor) with the earth, they got to own the produce.
the idea that libertarians support chattel slavery (I consider capitlaism to be, to some extent, wage slavery) or that that is the logical conclusion of libertarianism is slavery is just the laughable ranting of a leftist who wants to demonize their opponents.
Nicky - Rothbard was a more important libertarian theoretician than Nozick and he argued you could not sell yourself into slavery. This has become the dominant view of libertarians, although Walter Block refuted Rothbard's argument in a recent article in the Journal of Libertarian Studies.