How often does it really pay off for readers to take action on your email?  A recent Monday Morning Memo did just that, providing a $700 discount on an upcoming class for people who responded to a previous request for short answers to three questions:
http://www.mondaymorningmemo.com/?ShowMe=ThisMemo&MemoID=1823
Scroll to “Do You Remember the 3 Questions…”
Responding was free, beyond [...]