content: I think it was around /r/linux_gaming , but there has been multiple instances of all the steam machines selling out from stores.  In anycase, Its theorized Valve is for the long game (as pointed out, steam wasn't very good or accepted when it launched, but slowly it improved and is now loved by most) I suppose they're just getting started.  More key elements of their plan would be: new source engine is finished and used widely, Vulkan is finished and used widely, Vive gets launched. At that point they have basicly an ecosystem around steam machines/valve.