Are you sure you dont get points for this?
well for a number of years we did and it was Great, but Thanks to a # of Greedy SOs , who purcahsed 100s of 1000s in a month and cashed them in the bank right across the street when they left the Amex Office, it Died.
Now you can still do it I think $1k every 2 weeks or 4 weeks, but you wont get anything out of it other then the TCs for free.