Completely disagree, not defending AE in the slightest but I have no problem in having to do a little homework to maximise my churning miles. Not like it is hard to do anyways.

And to the person worried about their credit rating, I (and many others here) have applied (with my spouse) to about 10 different cards in the past year. Unless you have horrid credit I wouldn't worry about it at all.

And who cares if you get the BMO world elite for the 300$ credit and cancel 6 months later. Exactly what I did, not like any bank cares about you in any way, why should you?