It is quite simple really. You are seeing what I have been preaching around my areas for years now. Your customer knew they could get some illegals to work for half of what you would have wanted to do the job.
2013 Gravely 460Z 29EFI
2011 Gravely 36GR
2008 Gravely 160Z
2004 Gravely 34Z
1998 Lazer Z HP 48 (old faithful)