Because it's part of the Mileage Forum standard.. basic protocol for any thread on here. Didn't you know?
From the sticky:
Tips for posting new Mileage Run Deals:
We are trying to standardize thread titles.
List the airline, the route, and the price, e.g., AS: PDX-LAX $99+. Also list anything that’s particularly noteworthy or unusual about the fare (e.g., “books into Y, 150% EQM”).