Domestic flights over 750 miles, booked at least 21 days in advance, on average-loaded planes, will tend to be less than 10 cpm. If that is your travel pattern (or equivalent-ish for international) you will have trouble meeting the PQD thresholds. Given that aggregate CASM [cost per seat-mile] is usually in the 10 to 15 cent range, a seat for less than 10 cpm is nominally a loss-leader for the airline (but loosely, because the seat might fly empty otherwise). Profits are made primarily on closer-in bookings with a higher cpm value.