Keep all 30%: best if your audience already trusts you and converts on your word alone. Works well for tight email lists and niche communities.
20% commission + 10% discount: a practical split. The discount nudges fence-sitters without giving up too much commission. Common for review-style content.
15% commission + 15% discount: the strongest conversion offer. Good for price-sensitive audiences or competitive niches where the discount is a real differentiator.