Mark,
I do take exception with your characterization of Medicare Advantage (MA). I do agree that MA's design "virtually guarantees" that it will be more expensive. But who designed MA? It was a Republican Congress and Republican President who wanted to privatize Medicare.
Originally, MA plans were limited to payments of no more than 95% of regular Medicare. The reasoning was that private, free-market practices would be more efficient, thus reducing the cost for this program. Medicare recipients would get the same service, but at a lower cost to taxpayers.
It turned out that insurance companies could not make money if limited to 95% of the cost for regular Medicare. So the rules were changed -- rules that allow insurance companies to make more money. That is why MA plans now cost between 13% and 19% more than regular Medicare.
MedPac (the Medicare Payment Advisory Commission) has long recommended that MA plans be paid no more than regular Medicare. Congress, however, led by putative fiscal conservatives, has consistently ignored this advice.
MedPAC does recognize that a handful of HMOs are able to compete with regular Medicare. These HMOs cost about 97% what regular Medicare costs. They are, however, the exception and not the rule.
Finally, a recent report in The New York Times would challenge your conclusion that the costs from MA plans "come not from insurance company inefficieny or profiteering, but from the extra benefits shoehorned into it."
The Times, reporting on Humana's first quarter profits has this to say: According the Humana, "increased Medicare Advantage membership helped its first quarter profit rise above Wall Street's expectations."
If insurance companies were simply a pass through and didn't make more money through MA, then the number of MA clients wouldn't make any difference. Indeed, MA is a big profit center for insurance companies.
Other than that, your comments about insurance companies and MA plans were ok.