Definition of Black Friday (in the US):
The day after Thanksgiving, noted as the first day of traditional Christmas shopping, during which crowds of consumers are drawn to special offers by retailers.
The definition of special:
Better, greater, or otherwise different from what is usual.
The definition of offer:
The act of asking if someone would like to have something or if they would like you to do something.
Therefore, a special offer is the act of asking if someone would like to have something or if they would like you to do something better, greater, or otherwise different from what is usual.
I think everything should go on sale.
And I mean EVERYTHING.
(Every in-app purchase, of course.)
Perhaps 25% to 50% off?
Greatly appreciated
Cheers,
Shadow