Hmm. I won't get into the profitability/politics of healthcare, which is the actual answer. However, keep in mind the Mexican Peso is worth about one US nickel. So, if you're paying $5000 USD to have surgery, it's over 99,000 pesos. Not such a great deal, as they have universal health coverage. Although, they are ranked higher in quality of care worldwide than we are. There was a person on here at one point who was going to China to have her surgery. Surgery and her hospital stay were relatively cheap. But the stay included ONLY the room. Everything, down to her food had to be brought or bought. Including nursing care, which had to be hired daily. That has to add up.
So if you are considering going to another country for WLS, make sure you consider all the costs involved, as it is never just a flat fee.