I`m a big tea drinker, cider drinker, hot cereal eater and occasional mountain house eater... the idea seems great for long-term camping to me! Just a lil more than I'd like to spend.
Much of the typical camping fare is freeze dried or dehydrated and really doesn't require any real cooking. Most of the 'cooking' seem to amount to: pour in boiling water, cover, allow to sit for a time. French press, or <gag> instant, coffee and tea are easy. In a major breakdown of infrastructure boiling water will be a way of treating water.
Then again these specialized devices aren't doing anything you can't do with a conventional pot. The difference would seem to be a matter of efficiency and speed. And what your willing to spend to save time and fuel.
Of course, there is also the 'gee whiz' and cool factor. Which, for some people, may be, on its own, worth the cost.