Granted it means more now that its not like years ago where source engine games were the only thing on steam but yeah... source engine games do not require high end hardware to run.
The other thing that makes me wonder is how Steam detects *PHYSICAL* CPU's. It says that 56.93% have 2 CPU's. I find that hard to believe.
For those that do not know... if Valve is using WMI to detect the amount of CPU's that is a big pile of utter fail. Windows XP WMI *CAN NOT* detect physical CPU count properly. Only Vista and 7 can. Win XP sees a single CPU 2 core system as 2 physical CPU's. Win Vista and 7 have two WMI values. One for physical and one for virtual. I have a dual CPU with 2 cores per chip so I have tested this first hand.