Because to liquidate the items quick before the account gets banned for theft or credit card fraud.
That's a good point. Aren't some of the occurrences being described lasting for upwards of two weeks now though?
I havent seen any that were up longer than 1 or 2 days. Then again I dont understand why they would have to over do it like that and get 50+ of items if 5 or 6 would do and way less suspicious.