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Scalpers are already selling the Steam Machine for over $3000 on eBay despite Valve's efforts
(www.tweaktown.com)
This is a most excellent place for technology news and articles.
Also, Valve only officially supports Ubuntu LTS desktop (Gnome). And their own OS of course. Yes, despite having the Steam runtime. The only thing this means is that support agents will say "but did you try installing Ubuntu?".
I guess that means steam support doesn't end up being general Linux support.