Why would revenue management care if you booked $50,000 worth of non-refundable tickets and canceled last minute, only for you to receive $50,000 worth of Travel Credits that ostensibly you would have to use at a later date? Alternatively, suppose you booked $50,000 worth of fully refundable tickets and canceled all of them 3 hours before departure. You’d get your money back, sure, but what otherwise could they do? Tell you that you’re not allowed to book refundable tickets anymore? In neither case are you violating AA’s terms but using them as they are designed.