You can work at McDonalds or in cleaning whilst living in or near your existing neighborhood, surrounded by family and friends, possible even in a house you own. Not so much moving to a different state to some isolated rural community to do unglamorous work, even if it pays
more than McDonalds. cf Mexicans who think the move is part of the attraction (as well as obviously being more likely to be wowed by the salary offer and experienced in hard manual labour; there are seasonal farm work recruits who don't fit those two brackets though, like British university kids picking apples in New Zealand)
If you're looking for the subset of manual labourers willing to move to remote locations, you're competing with oil companies that really well, and people aren't queuing round the block for those jobs either. Labour intensive food production isn't particularly likely to be able to compete with oil on salary.