Originally Posted by
moondog
Take LAX-HKG, for example.
It's a 15 hour flight and the difference between Y and C is ~20k miles, or 2/3 of a credit card application.
Having experienced both products (Y and C on CX), the decision is a no-brainer. What's more, F for an additional 12.5k miles is also a no-brainer.
On the domestic front, I agree with you.
For a trip AUStin - SYD, Mrs. Middle_Seat and I flew Economy Plus on UA. Had to pay a couple of hundred dollars for the Economy Plus membership, and used it again for a domestic trip before it expired.
All other trips, we try for exit rows.