I've been a DC member for several years and had never heard of the retention bonus until I started using this site a week ago. I just called DC and asked for it - no problem - got the 1000/mo. for minimum of $150 spending per month. Thanks to all who posted this.
A few years ago I challenged Amex to offer me something to stay - like waiving the annual fee. they refused to offer anything. I closed the account.
Doug