Read-through-rate is the key to success when it comes to the quintessential method of making money via self-publishing. So if yours isn’t nailed down tighter than a Kansas cowshed, then, darlin’, you got problems. — And guess what? This is what’s been killing me the last few months, too. RTR stands for read-through-rate, and put simply, is the percentage of people who, after reading a book in your series, will then go on to buy your next one.