"Does not have skills in high demand"?"value" is subjective and personal. "unskilled" is really a shorthand term that means "does not have skills in high demand in the market".
You may place a very high value on your ability to pick your nose. But if no one else values this skill it won't make you much money.
- - - Updated - - -
Way to go Captain Obvious. You have successfully argued that employers value labor.
Tip: that's why they are willing to pay for it.
Really?
Pretty sure there's more demand for waitstaff and janitors than there is for hedge fund managers.
Compared to those qualified to do the job there's a lot more demand for hedge fund managers.
Note, also, that with things like hedge fund managers small differences in ability translate into large differences in value to a company and thus large pay differences.
From your side again and again I hear that the worker should get a share of the value they produce--well, that hedge fund manager produces a lot more value than the waitress.