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Here’s how much Valve pays its staff — and how few people it employs
(www.theverge.com)
This is a most excellent place for technology news and articles.
My point is that it isn't charity. It's just a smart business decision that reduces their cost greatly and let's the community work for them for free. With all the licenses involved, I don't even think they can even add a charge.
If they could have built the same product but closed source, they would have.
I love FOSS and in the end this benefits he community, I just don't think that was the driving factor behind the decision and it doesn't excuse them bleeding dry developers and colluding with other store fronts.