
Due to the fact that the game has earned in the online store Valve more than $ 50 million.

The standard commission that Valve charges on Steam games revenue is 30% – however, in December 2018, the company reduced the share of the collection from profitable titles.
So, when the game earns more than $ 10 million, the Valve commission in excess of this amount is reduced to 25%, and when revenue reaches $ 50 million, the fee in excess of this amount is reduced to 20%.
The accumulated revenue from sales of The Witcher 3 on @Steam platform for the period of time between October 1st 2018 and today has exceeded 50M USD. As a result, we are now getting 80% on any subsequent sales of TW3 on Steam.
— CD PROJEKT IR (@CDPROJEKTRED_IR) February 20, 2020
Thank you all for your support! pic.twitter.com/JgNgrrI5h0
The Witcher 3: Wild Hunt collected revenue of $ 50 million for a year and a half – from October 2018 to February 20, 2020. Sales of the third Witcher in mid-June 2019 exceeded 20 million copies – this is more than half of the circulation of the entire game franchise.