Cheating or why fool the people

I first learned that PG has a shop.

And what is the deception?

The author, prices from third-party partner stores are updated once a day in the dead of night.
It so happens that the event lasts only a day, and the price update is happening after the promotion is over. All the time since the end of the event, specify the old price until the upgrade price without the promotion.
http://joxi.ru/JMAjXXXtZ6Z0me