"Someone is doing the work, who could it be Luis, ..."
Ever hear the term migrant workers ? They have no need to hang around and freeze their butts off with no work - a lot of them probably go home for the winter. What do you think the people who do the work do in the off season - starve ?
Kind of like an illegal "guest worker" program...
There's nothing more permanent than a guest worker. That was proven in the 1950s when Eisenhower had to show millions of "guest workers" the door.