You would be surprised at the some of the so-called "Jobs Americans won't do". Agricultural worker is by far, the the lowest paid job.

http://www.forbes.com/2008/05/15/jobs-c ... 5jobs.html

That helps explain why mean annual wages appear lower than one might have expected at the top end and higher at the bottom, where undocumented workers are unlikely to be counted accurately and sources of cash income like tips are underreported.