Maybe that worker has to produce a lot more $$ because he is supporting more than himself. Maybe his family in Mexico is, er, large.
I don't believe that so many UNATTACHED males or females come here. Why would they? It's not HOME. And I don't think they have the starry-eyed mentality of the first immigrants. They are here for ONE reason: DINERO.
It all seems to depend on and goes back to the USA and China.
https://www.reuters.com/article/us-mexico-economy-peso/mexico-peso-headed-for-choppy-waters-on-back-of-trade-uncertainty-idUSKBN1X12A3
You need to read the entirety of the posting, especially the last line where I state that an immigrant, legal or illegal, making DINERO equivalent to 400 to 600 USD in their currency (DINERO) is why they come here. 8000 to 12000 Mexican Pesos is what the individual worker makes in Mexico, family or no family. If an individual, legal or not legal, can come here and make 900 and up in USD a month they have surpassed the amount the average worker makes in Mexico. Of course it is about the DINERO. That’s a fools folly to think otherwise.