Let's face it, anyone perennially available for such work as a lot of the "guest workers" do, doesn't want to do any sort of work anyway - they would only accept a job for a really high wage and then shirk their duties and waste the farmer's money - part of the system is because of the nature of the jobs which are not constant enough for anyone to make a living off. Other than bitch that it's only because "They won't pay enough for a self-respecting American to bother with them jobs", get a dose of reality - they'd have to be even sweeter deals than teachers get - instead of getting couple months "paid vacation" in the Summer, the majority of the jobs the guest workers handle are during that two months and not for the remaining 10 months.
We will crush you, watch.