It's not about speculating, it's about giving thoughts that may help PP make their choice. A serious Steam addict for example will have very good information to bring to the table.
I use Steam, but wouldn't call myself an addict, though I do have over 40 games in my library, lol
All Steam is, is a portal for buying, storing and playing your games. The prices that are offered are what the games developers are asking for. Any games that are included in the 'Steam Sales' are games where Valve (the creators of Steam) have contacted the developers and based on their number crunching statistics, said to the developers "Look, if you put your game up for sale with XX% discount, you will get XXX purchases over a given period".
This is what happened on Steam with Kunos Simulazione, who are making Assetto Corsa. KS put the sim up for Early Access at a discounted price (€34.99) from their RRP value (€44.99). After a few weeks, Assetto Corsa appeared in the Steam Sales with 25% off the already discounted price, so was now (€26.25), because Valve had contacted them, given them the figures and Kunos said, "OK". It is now back at it's initial discounted price of €34.99.
Games range from just a few quid - usually the Indie developers - to anything up to £35/£40 from the more well known development houses. But over time, almost all titles will appear in some way, shape or form in the Steam Sales.