How many of those 9,000 windows steam games run on the consoles? (BTW it's closer to 3,000 - 3,500 unique windows games - excluding DLC).
Somebody that already has a gaming PC (presumably with Steam) isn't the target demographic of this push. Folks who want console level convenience but would be open to saving money buying on Steam are. And what will they see when Steam Machines launch early next year?
PS4 169 Total Games released and announced
XBONE 77 Total Games released and announced
Steam Machine 300+ games already released (and purchasable) *and* more coming soon.
Then look at the other features you'll get with a Steam Machine (and Steam):
* Steam Sales
* Steam gifting (give your grandkids a Steam Machine then send them games through steam from your home PC/Tablet/Phone, etc)
* Access to player mods (Steam Workshop)
* Free online play (MMO's w/ monthly fees not included)
* Equal or better hardware depending on your budget
* Upgradeable hardware
* Made with COTS HW -> easily fixable
* Games you purchased on your Steam Machine are tied to your account, *not* your machine. On the road? Open your laptop and pick up on your games where you left off.
* Ability to play 3rd party/unlicensed titles without jailbreaking
* Compatibility with PC hardware (that works with Linux). Mouse and KB anyone?
* Compatibility with XBOX 360 and PS3 controllers (and surely XBOne and PS4 to come)
* Full desktop mode!
* Controller that's nearly as precise as using a mouse (and miles ahead of the console controlers.
* Devs can issue patches for free! (looking at you Microsoft)