My kids never did the logs (and they didn't fail LA), and they never responded to rewards, especially the summer library programs. They thought the rulers, yoyos, pencils, etc were lame, so by the time they were 13 and could win an iTunes card or a gift certificate to the local indie bookseller, they said "meh". I asked if they'd do it anyway and give ME the prize! Nope.

Unfortunately, this lack of incentive carries over to grades. They don't go for the As. Or Bs...