i am no special person, i am pretty skinny so they have low fuel expenses on me compared to some short fat people and i have no problem to travel with reasonable polite people who won't recline seat for someone much taller seeing behind them
but ok, let's stop being polite and charge people per kg of weight if we do this already with baggage, at least fat people will have motivation to stop eating, not sure what unhealthy i did that i grew tall and should handle ignorant people reclining seats