It isn't technically Google-operated: they've outsourced it, which is fairly common for promotional goods. (McDonalds doesn't specialize in making T-shirts, after all.)
What I find hilarious is that if you buy an $8 T-shirt from Google you can actually talk to a human being about it, which makes that approximately the only Google-brand product sold for under $100,000 where that is reliably true.
Google has had a store for a long time. As far as I can tell it was at one time the only way they were making money - before AdWords and the Google Appliance were invented.
For more details check this earlier post on HN : http://news.ycombinator.com/item?id=652807
Apparantly google is outsourcing it to some 3rd party (in this case it's Merchandise Mania Ltd, Borehamwood, UK)
$5.20 (plus shipping) for 4 pens that "write amazingly well" is too much money? Why not just buy the ones you like and stop spending time/energy on the "problem"?
What I find hilarious is that if you buy an $8 T-shirt from Google you can actually talk to a human being about it, which makes that approximately the only Google-brand product sold for under $100,000 where that is reliably true.