No doubt hey? Bigger/more usually costs more ... more octane in fuel = more $$ ... more property = more taxes ... more insurance on your car = more $$ ... more french fries and an extra patty on a monster burger = more $$
Regardless, if someone takes up more than one seat, they should pay for more than one seat and of course have that seat beside them to use. I don't think anyone here was saying fat people should pay more for a plane ticket simply because they're fat. One seat per person, if you use more you pay more.
If they're such nice people then why are you posting potentially embarassing pictures of them? For your amusement? Or are you supposed to be teaching us something here?
And no, sitting next to a black/asian/jewish/whatever person is not offensive, that was you being a tad ridiculous. Being sat ON by someone who is too big to fit in their own seat IS offensive.