Cause then they'd have to set a 'standard' weight and charge extra from there, but does that mean that the people who weigh less than that get a cheaper price?

Say three people who had an ED boarded the flight, One weighs more than the standard weight thus reaffirming their beliefs and worsening their disorder, then someone who weighs less than the standard would get hit with the belief that its working and their weight loss is a good thing, which worsens their disorder

Then the person who weighs the standard, still thinks their fat cause they can get cheaper tickets if they just lose a bit more weight.

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It'd promote unhealthy weight loss.