These kinds of promo's are generally (where the correct process is put in place) targetting specific members (or groups) where the business (QF) believes they can best obtain benefits (read profits), whilst at the same time there is a corresponding win/win for the client/customer/member (increased status credits/status uplift).
Don't forget, the average travelling public doesn't look laterally at these kind of offers to "squeeze the lemon", as we may do.
Now, just what information they (QF) use to work out who is on the list, sometimes is a bit nebulous
.