The author explains that using CPC (cost‑per‑click) rather than CPM (cost per thousand impressions) keeps spending under control, because money is only spent when a reader clicks the ad.
By setting bids below BookBub’s suggested range, the author stretched a $50 budget for a mystery thriller called The Architect of Deception over five days, generating more than 90,000 impressions and enough data to evaluate performance.
Small budgets also allow creative experimentation. A headline reading “Read it so you can say the book was better” attracted three times more engagement than a “Champagne, Caviar, and Murder” line, despite both costing only a few dollars.
Targeting specific authors proved decisive. Five parallel ads each referenced a different popular romance‑suspense writer; the ad aimed at Sandra Brown’s fans delivered three times the clicks of the others, while three of the tested authors generated almost no clicks.
The author concludes that isolating variables—bid amount, copy, and author audience—within low‑budget CPC campaigns provides actionable insight without large expenditures, and that the approach consistently outperforms the author’s social‑media ads in click‑to‑download rates.