I’ve asked CD Projekt RED about the prices on Steam and here’s an e-mail I’ve just received:

Hello,CD Projekt RED is not a direct seller of the game, the seller is Atari.

Price of the game is determined on the basis of Valve -> Atari offered money plus a margin.

CDP RED is the creator of the game only and does not affect the pricing policy of the companies – Valve and Atari.

Take care,

Justyna Hryć
Assistant Customer Service Department

Which simply means, Valve offers the price and Atari agrees for it.
And as we all know Atari lowered the price in € for The Witcher.

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E-mail from CD Projekt (The Witcher), 5.0 out of 5 based on 1 rating