well the fact is that people are willing to pay 575. i guess the reason is that when you do a redeem with zab you may not get ur funds for a while, for example if you put ur redeem in at 10pm you probably will not get it untill what 9am the next day.while i am okay with that, a lot of people do not want to qiat. so if you want to do a redeem but know that it will likely be awhile before zab is back on why not just by it from someone else and get it instantly?