Is Kroger's Grocery false advertising?

Krogers advertises a $5 rebate for their 'mega event' item sale. If you buy any ten items, from a larger list of items,you will recieve the rebate. Also on the sign appears a lower sales price when you purchase a minimum ten items. One leads to the conclusion that you will purchase any said ten items, receive them at the lower price and receive a $5 rebate, however this is not so. The $5 rebate actually applies to cover the cost of the lower sales item. One would not receive the rebate, just actually the items lowest advertised sales price after the rebate has been applied. I think their ad is falsifying information and close to false advertising. I read on the false ad law and there has to be some kind of injury that results from false advertising. But isn't their ad a legal "scam" still?