It's clear that tipping/zaps/value4value don't work as a sustainable business model for anyone trying to seriously monetize here on Nostr. Put simply, not paying is the path of least resistance. What could have a chance of working is the ability to subscribe to certain (high value) user feeds and/or pay-to-read notes. It seems to me that this could shift the incentives and boost/increase the content value and creator economy here on Nostr.