Just checking up on the subject about sales. This is snipped from Steam/Valve
Free and Paid Distribution
Valve may choose to distribute Your Contribution for free and/or for a fee. Where Valve distributes Your Contribution for free, Valve has no obligation to compensate You. With respect to Third Party Games, the end user license or subscription terms for the Third Party Game may preclude You from giving Valve the right to distribute Your Contribution for a fee.
Payments for Paid Distribution of Valve Games.
If Valve chooses to distribute Your Contribution for a Valve Game for a fee, then Valve may set the price for such distribution in its sole discretion, and Valve will pay You as follows, conditioned on Your compliance with the obligations contained in this Agreement. Beginning with the calendar month in which Valve first distributes a copy of the Valve Game Contribution for a fee, Valve shall pay to You twenty-five percent (25%) of the Adjusted Gross Revenue (defined below) actually received by Valve from Valve?s distribution of the copy of the Valve Game Contribution during the calendar month. To the extent that the payment calculation results in a negative amount, that negative amount will be carried forward and deducted from any future amounts otherwise payable by Valve hereunder. Valve will remit payment in accordance with Valve procedures, currently net 30 paid in full. Please note that Valve may change procedures in the future, for example requiring a minimum amount to accumulate before making a payment. You also acknowledge and agree that other users, and Valve itself, may create other works that are similar to Your Valve Game Contribution(s), ...............
It looks like Valve keeps the right to sell the game at whatever cost they want. So it looks like they can have a sale whenever they want too. Regardless of what Scirra wants.