I came across this quite by accident today. Buried in the fine print of a new promotion from our friends at Chase is a clause that basically says "we are limiting incentives to brand new customers only" To that I can only think of the old saying "Fool me once shame on you, Fool me twice, Shame on ME". I thought you might find it as amusing as I did.
Replying to this offer: If you omit any information on the form, we may deny your request for an account. If applicable, Chase cardmembers who currently have or have had a Chase credit card in any Rewards Program associated with this offer or have received a similar bonus offer, may not be eligible for a second Chase credit card in the same Rewards Program, or for any bonus offer. Chase cardmembers currently receiving promotional pricing, or Chase cardmembers with a history of only using their current or prior Chase card for promotional pricing offers, are not eligible for a second Chase credit card with promotional pricing. You must have a valid permanent home address within the 50 United States or the District of Columbia. The information about the costs of the card described in this form is accurate as of 12/22/2008. This information may have changed after that date. To find out what may have changed, write to us at Cardmember Service, P.O. Box 15043, Wilmington, DE 19850-5043.