I've had similar experiences at other places and there as well, Usually tier renewal and birthday offers are just an extra unit (of whatever your standard offer is)
Other places like Seminole use to give an air book computer for maintaining x card stAtus
Maryland live use to give a Mercedes leasee( they still may)
I got $3 at Aliante for my birthday!
I have their highest tier card. It's rediculous. I refuse to even play there now.