I think they did smart thing to offer special services such as that, otherwise what’s the incentive to buy from them especially since they shortened return window to 15 day counted from the day of order plus charges $15 for return shipping.Well you can request anything you like, but I have the impression that they offer popular items to the buyer with the highest offer, and go down the list from there.
They typically just send you an email saying that they have sourced XXX on your wish list and that they will list it for $XXX if you decide not to purchase it. Basically, it’s just a chance to purchase before something goes on the website since hard to find items are sold so quickly sometimes.