Problem is that some planes dont have a first class section, like the one I went to egypt on earlier this year on my honeymoon, where I had to sit squashed in for about 6 hours next to the 'large' person who didnt fit in the single seat so took up half of my space as well. I would have gladly paid for first class if it was an option, but on the dates we wanted, the choice of airlines was basically one. Not the best start to the honey moon so i'd be all for airlines charging more for people who take up more than one seat.
As i said before, I dont think its a case of airlines profiteering, the feul costs are massive and ever increasing, so I guess its a case of charge more per seat, or put more seats on the plane, a whole host of budget airlines went bust over the last few years because of the feul hikes, because they tried to keep the seat cost down.
And to be fair, im off to egypt in a few weeks and the flights were only £65 each, its going to cost me more than that in fuel travelling to the airport and parking the car so I dont think that easyjet can be accused of over charging!!
In hindsight, I wish I had bought 4 tickets instead of two so that me and the missus could travel in comfort with a completley empty seat next to us, I wonder if they would allow you to buy two seats in one name?