The runflat tires can save you a bunch of money if you have those crazy expensive rims on your car.
Don't you have to replace a runflat tire if you drive it on the "runflat" interior for very long? Aren't those expensive too? I don't have data, but I have a colleague that got rid of the run flats when it was time to change tires for several reasons, one being how expensive they were to replace.