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Valve runs its massive PC gaming ecosystem with only about 350 employees
(arstechnica.com)
This is a most excellent place for technology news and articles.
For storage or for download?
Download. It's also rounded up. Storage is negligible compared to bandwidth, especially considering Steam's business model
And their cost is going down over time while their revenues are increasing since they take a % off every sales and sales are increasing and so is the average price of games.