I don't know that we have "sucker" written all over us.. but closer to "captive audience" - given that DJ, while they do have velocity, it really can't compete in this area (IMHO) and the foreign airline loyalty programs would only capture a small percentage of customers, and anyone who is high enough yield to QF for them to care about (read J and F buying passengers) would be locked into QFF anyway.
Of course we know anytime the word "enhancement" is used it's BAD for the customer!