I'm in two minds. I'm 6'2 and 100kg, so should I pay more??
Its bad enough trying to fit myself into cattle class as it is, but to pay more.
However, I have had the "pleasure" of sitting next to someone whose girth was not accommodated by the width of the seat, hence overflowing onto me.
As I sit with my shoulders off centre anyway, this was not a comfortable arrangement.
Perhaps instead of weight, they could disguise this by measuring girth?
Therefore they could have some seats that are slightly wider, but cost a bit more??
I'd be pissed if they said to me, "You weigh 15kg over average, cough another x%"