What percentage of them do? I'm sure you've got that number right in front of you.
You need to seriously get a clue. The vast majority of them cannot save significant wealth that would afford them much of anything here in America. In mexico their money goes much further. Its the same way someone from India can work for much less than an American, take his money back to India and come out ahead.
You have essentially just told everyone that you have no idea of what you are talking about.