...what else is there that a laborer can bring to the table other than their own labor?
It's as if we're rediscovering the stated purpose of unions, right here in this thread! The union can negotiate with everyone's labor, not just that of an individual worker.
I understand the stated purpose. Why should an individual benefit from the abilities of others just because he/she happens to belong to the same community? I think if we can ask the question in its most basic form, which is what I am trying to do, it may be clarifying.