No, it's not comparable to DirecTV. Most of your DirecTV bill goes to the content providers, not DirecTV.
Does it really? http://allthingsd.com/20100308/hate-paying-for-cable-heres-the-reason-why/ I totaled every channel in the left column at about $19, the other 3 can't be more than $10 altogether. Once you get HD service for a couple of TV's and your promo pricing expires your looking at around $90 with D*. Of course that price list is an average of what cable/DBS services pay. But if anything Directv pays less. If google is just looking to break even on TV cost as a bonus to their fiber service they could very easily offer a large number of channels for $50/month.
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