If you are a Libertarian and hold liberty as your core value, why do you not believe in universal healthcare? Nothing impacts liberty more than sickness and death.
I don't think libertarians really see wage slavery as the worst thing.
I think the fundamental difference is that libertarians don't care about outcomes. Or, at least they don't think that they do as long as they have food in their stomach and a barrier against the cold.
In their minds, it's all about them not being compelled to partake in anything they don't want to. If that means starving, fine (so they say, and I'm very suspicious of this claim), but at least there was no authority over them.
Most sane people strike a balance between valuing good practical outcomes, and more abstract notions like liberty and justice.
Full authoritarians say that only outcomes are important, that abstract notions like freedom are impediments to the greatest good, and you end up with things like the USSR.
So you're right that there wouldn't be a minimum wage... But you're wrong to appeal to the concept of wage slavery because it presupposes a libertarian values satisfactory outcomes. They don't.
Honestly there is no talking down a libertarian without first convincing them their lives are worth more than some definition of liberty.
Roads? Slave labor. Taxes? Slave labor. Taxes that fund the police? Somehow not slave labor.
Like you're not wrong, democrats do advocate slave labor in the form of supporting the prison-industrial complex, but I know you're not talking about that.
Glad you brought that up. The US Dollar hasn't meant anything since coming off the gold standard, and we can't control it's value so long as the Federal Reserve controls interest rates, and the government has a monopoly over what currencies we can and can't use. (No this isn't advocation for company script, if you can't spend it anywhere else it's not currency)
With actual competition between companies, the laborer could actually compete for the best jobs and get the best compensation for their labor.