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The RAM shortage is coming for everything you care about
(www.theverge.com)
This is a most excellent place for technology news and articles.
I was pretty confident that Valve was not going to subsidize the Steam Machine from the start, even before Valve said that it would be priced comparably to a PC and even before it said that it was delaying determining pricing (which was a good sign that it hadn't locked in a contract price on components). I commented along those lines here.
Consoles can do the razor-and-blades model because they are a closed platform. If you buy a Playstation, it doesn't do you much good unless you use it to buy Playstation games. So each Playstation purchase is very, very probably going to be used to purchase Playstation games. Sony can crank up prices on those and make their initial loss back.
But the Steam Machine is open. I can go run whatever on it. I can just take the thing and, say, make it a media server or whatever. And if Valve subsidizes it, people will just buy it instead of a comparable PC and then run whatever they want on it. Doesn't make much sense for Valve, just because of the nature of the machine.