This is the most common "win." If you need 60,000 miles for a flight but only have 57,000, buying those last 3,000 miles is often worth it to secure the booking.
If the price you are paying to buy the miles is higher than this number, you are losing money. Better Alternatives If you're short on miles, consider these methods instead: buying miles worth it
There are only a few specific scenarios where buying miles makes financial sense: This is the most common "win
Value per Mile=Cash Price of TicketTotal Miles NeededValue per Mile equals the fraction with numerator Cash Price of Ticket and denominator Total Miles Needed end-fraction buying those last 3