This whole discussion is very interesting from an educator's point of view. I have taught a number of research courses in which we discuss "correlation." The common use of that term, and what many here are using it to mean, implies a cause-effect relationship. Correlation is NOT necessarily a cause-effect relationship. We can find many things that are correlated in which one of the two things does not cause the other. In cases like this there is often a third thing that causes both of the other two things. In this case a frugal mindset might cause a person to seek an inexpensive RV AND a lower cost of living. The cheaper RV doesn't CAUSE the lower cost of living. The frugal mindset causes both.
It's a good object lesson in this important concept.
Tons of research that you read about in the media is research that has found a correlation between two things. Almost always people misinterpret this as a finding that one of those things causes the other. Very little of the research you read about in the media has actually examined to see if there is a cause-effect relationship. That's much harder research to conduct.
-Speak