I've seen the one-hour promo used with increasing prices in the countdowns, for a fairly popular author - the point was to drive as many sales into that one hour as possible, mostly of fans "in the know", in order to influence the bestseller position and the list that shows highest movement. Fans who checked late or those that found out via social media, often paid a buck or two (or more), as the day wore on and the sale got less attractive.
Spacing the same total sales across a day or three would not have had as much impact on the sales lists (mostly at Amazon, as few care about the lists other places other than those big ones, such as the NYT) as getting them all at once.
|