Node operators don’t charge yet only because nobody implemented a good / easy UX around it. But there is at least one node they implemented a lightning invoice for access to their node. 

I think the point (at least what makes it appealing to me) is that NOSTR nodes can provide transparent business models. 

thrown

Nostr payloads are not currently charged for, they are free. So you're not paying for them.

supertestnet

bitcoin

Whisper Addresses: Privacy preserving automatic bitcoin address generation in vanilla javascript

> It would be a bit of spam though

you’re paying for it, so it’s not spam. more like a normal message delivery service. i would hope that encrypted payloads become more common on nostr tbh. 