I don't see why you need a central controlling authority. You could implement this on your own MX. Senders initially get a bounce explaining the deal. They can then sign up, select what they are willing to pay per message, and they go onto the whitelist. When subsequent emails arrive, sender is charged (might need to require digital signatures here, the service could issue those as part of sign-up). If email isn't read in X days, charge is refunded.
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I don't see why you need a central controlling authority. You could implement this on your own MX. Senders initially get a bounce explaining the deal. They can then sign up, select what they are willing to pay per message, and they go onto the whitelist. When subsequent emails arrive, sender is charged (might need to require digital signatures here, the service could issue those as part of sign-up). If email isn't read in X days, charge is refunded.
I couldn't eyeroll enough if I got something back from an MX like this.
I don't care who you are. I'm not paying money to send you mail.
There's a pile of problems both technical and social so enormous that this idea is so blatantly bad it isn't even worth serious consideration.