Would a pay-per-post model work (similar to classified ads in a newspaper)?

Not sure if that would work since there would be an ongoing cost to preserve older notes. Maybe if there was a simple and affordable way for the average user to donate storage and bandwidth to host older notes that had to be deleted from 'professional' relays?

nostr:note149v976664ptpsfyg4ll5l80888gzud40j99l7pp84gsfn9sattcqzj6pdk