This is essentially what Damus did a while back. It's an opt-in choice for users on the amount they want to split for funding.
Discussion
And that’s a great way of funding.
But essentially the big problem is that 90% of people are not sellers and they don’t know how to ask for funding.
But no matter what the Nostr ecosystem is getting better and better, and that’s what matters 👊🏼🫂