At some point they come to the realization that some cabins wont be sold so they can upgrade guarantees there or offer a reduced price . I did hear about an $800 offer from v2 to penthouse some years ago, although I don't expect that would happen today as ships are booked pretty full.
we are on March 20 , 2023;Northern lights. Still many cabins available. March 8 sold out. So maybe in two weeks something happens I expect we will get v2 or maybe a DV.