Carol,
My cost analysis isn't flawed, although some readers may be misinterpreting what I wrote. I know she has (or had) a mortgage -- which may or may not be paid off by now -- and I clearly stated that my cost calculation excludes the mortgage. If she only goes down for a few times a year, rather than (for example) 9 months a year, that only would only reduce the advantages of ownership compared to renting (or paying for an AirBnB).