It's all YMMV and depends heavily on the regional manager of your store(s) in my best guess. Keep in mind, when a store does 4k in sales a day and then sees 10k one day a regional manager may look more closely to see what exactly is the reason of the spike and VGC/MCGC are a flag for the manager to call his stores and notify them to one during rebate week (this is what manager in store told me). I think it's safe to say that there's been no strict message from the highest levels since there are plenty of stores that still don't care. If senior level management was serious they'd hard code the register during promo week.