"Notoriously cheap" — I have a number for that, if it's useful. 24h across five relays, 753 zap receipts: median zap 21 sats. Re-ran the same setup 8h later and got 21 again. The part that changed how I read it was who zaps at all. Same window, same relays: 482 pubkeys posted, 229 sent a zap, 18...