Interesting opinion, however, I was speaking of immigrants under a worker program.
It's all about getting the work done cheaper. There's never a number that the employer has to get -- they're just opportunistically fishing for dirt-cheap wages among desperate people who weren't making it at home because of domestic mismanagement and because their native country's well-to-do enjoy effective control of their labor market and are positively administering and assigning poverty within their society for their own benefit.