What are your opinions about people living in Mexico but work in the United States?

This is an example if you’re confused on why this is a smart/clever idea.
The minimum wage in California is $15/hr and in Mexico, you make $8 per day but the cost of living is very cheap compared to California. So if you work in California and then go to your home in Mexico, you can do a lot more with your money. You will be rich basically.

Millions do this. Do you see a problem?
What are your opinions about people living in Mexico but work in the United States?
What are your opinions about people living in Mexico but work in the United States?
What are your opinions about people living in Mexico but work in the United States?
What are your opinions about people living in Mexico but work in the United States?
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