I do think right now zap amounts are low because there isn't enough Bitcoin flowing through Nostr. It's not a circular economy until we have a way to pump Bitcoin to people while they are on Nostr who can then zap content they like. (See #attentionmarketplace) Right now everyone is either passing the same Bitcoin back and forth or a generous Satoshi millionaire is just throwing it around. That's not sustainable and probably why this may only work for now in a handful of countries.