Is the Ad Worth the Price?

I’ve been getting emails from Amazon offering an advertising package for my children’s book, Winthrop Risk, Detective.

Seems they’ll have my book turn up here and there when someone searches for something in my genre.  Each time someone clicks on my book, I have to pay Amazon something like 25 cents.

Have any of you self-published daredevils used Amazon’s service?

Was it worth the price?