I think I get it but isn't the idea basically that rich people pay more to feel they're being eco friendly? While poorer people feel the effects as usual.
(As well as regular product endorsement)
If you've taken the flight you've taken the flight. Throwing money at it does not remove the impact on the environment, surely. It just means you've paid for your 'use' of the environment.
It may well be a good thing in itself. But it's not a green light to carry on as before and make no changes.