Surely the purpose of the exit row is for it to be suitable for the evacuation of the aircraft and the ability of the seats, the space and the people sitting there is to best facilitate that if such a need arises?
Thus the 'comfort factor' is a bonus, not a privilege.
And therefore such seats should not be sold at a premium and filled only with people capable of performing adequately if an evacuation is needed?
Seems pretty chuffin' obvious to me.
Frankly I don't want to be burnt to death because some obese, geriatric with toddlers in tow can't open the exit and get their ass out of the 'plane.