Is it unethical? Probably since doing this would not necessarily be beneficial to other people. But when I think about award reservations, I would say it's really about rewarding myself. True, awards, particularly the specific ones I intend to have at times are hard enough to secure, that when in fact I do find one and can actually insure/protect the reservation from schedule changes or whatever with another duplicate reservation, I would readily use this option. Ok let's say that it's unethical but it's something I will not lose sleep from. In fact, knowing that my award reservation is set and 'insured' will make me feel better.