Many immigrants (undocumented and not) will perform many jobs, often skilled trades for less than $10/hour.
These jobs range from computer programming and skilled construction to cleaning landscaping, agriculture, and hospitality. And the quality of the work ranges from OK to pretty damn good.
And very often, the work is wildly profitable and helpful to the employer.
Now, the pay check is often cash and not taxed under-the-table. If taxed, the taxes are almost nill on sub $10/hour work. The social welfare element is also a substantial component. This is the same argument made against subsidizing much of the WalMart labor force.
(Gross pay) – (Minus taxes, if any) + (Social welfare) = (Not too bad!).
A pretty decent hourly rate … all things considered.