World Health Organization confirms what we say

You can certainly find all this information yourself, but I will help speed it up with a link:
http://www.who.int/leishmaniasis/resources/COSTA_RICA.pdf


A part I like (because it mirrors what we say): Access to [health] Care: The Costa Rican Social Security Fund, which is the agency responsible for the provision of health services, provides coverage for approximately 90% of the population.

Another PDF from WHO clarifies:

Ninety percent of the population belongs to this health insurance system and the remaining 10%

can use it if necessary for emergency services.

THIS is why we can do what we do. The healthcare costs in Costa Rica have been forced to be extremely low, set by the government. The above WHO reports also confirm how stable and safe it is to travel in Costa Rica.