It might be because they're the same thing. Libertarianism leads to oligarchies led by the richest. Billionaires seem to like this idea. I suspect the reason

It might be because they're the same thing. Libertarianism leads to oligarchies led by the richest. Billionaires seem to like this idea. I suspect the reason is so they won't have anyone nagging them to pay taxes and could write law without having to spend money funding think tanks and lobbyists.