A bit defensive of obese people there SAS - just remind us how much you weigh?
Of course there has to be a limit to the max weight of a passenger, although its something we seem to overlook. The seats will have been designed and certified with a specific pax weight in mind for crashworthiness, perhaps its only 100kg? And they have to be able to get out in an emergency without excessively impeding others. And who wants to be sitting next to them?