You're right in that some works do require significant budgets to complete. Is there absolutely no other possible way that such works could get funded without an individual person buying only one individual copy of that work to post-hoc fund it in aggregate?
"No! Nothing but this system could ever possibly work. It's pointless to even speculate on anything else existing."
I don't think that's your position, but you sure couch it in those terms. You sure ended that dialog in those terms. Did you mean to?
I'd like to see real discussion around this topic, but before it even gets off the ground, the mere existence of such systems are assumed impossible and the seed of such a conversation is accused of what you accused the grandparent. I want to entertain the notion.