Well no, but salutary nonetheless. From Bill Bryson's recent memoir The Life and Times of the Thunderbolt Kid (a birthday present from a friend who apparently knows my taste even better than I do myself, as it's not a book I would have ever picked up on my own yet I loved it):
Each year the teacher held up my pathetically barren [U.S. Saving Stamps] book as an example for the other pupils of how not to support your country and they would all laugh--that peculiar braying laugh that exists only when children are invited by adults to enjoy themselves at the expense of another child. It is the cruelest laugh in the world.
Forty years later it is still too painful for me to put my own example of this laughter here; suffice it to say that it involved a teacher announcing to the class just what book I had purchased that month from the Scholastic book club. No wonder I'm such a freak about reading privacy.