Giving away Nexus 7's seems hard to explain away. I mean, I tried to think of any reason why they might have wanted to give them all 7" Android tablets, like maybe an interesting way of distributing a multimedia press kit or something, but that could have just as easily been handled by $75 Chinese-made Android tablets.
That did make me think that that'd be pretty cool though; imagine buying a bunch of modestly-spec'd 7" Android tablets from China wholesale, and using them as giveaway items to distribute really dynamite multimedia presentations.
I actually picked up FOUR 7" Android 4.x tablets from DealExtreme for ~$35 each last year, during a half-price sale...and I doubt they'd let even such a sale as that rob them entirely of profits... So I imagine if you're a company buying tablets like that wholesale, you can get some pretty sweet deals, AND get them all custom-branded.