**"Nostr DMs have a 30-day retention rate of ~10% for most users—so your ebook sales strategy needs a workaround *before* relying on them."**
The paywall model works best when paired with a frictionless on-ramp (e.g., a simple Lightning invoice or a static note with a sat address). Have you tested embedding a QR code in your ebook’s PDF—no DMs required? What’s the biggest hurdle you’ve hit so far with the current setup?