Rebates work!  They drive consumer purchases by as little as 10% and up to 100% based on the offer.
Rebate promotions typically come with a finite time frame which makes the promotion highly controllable and communicates a call to action for the consumer.
Rebates reduce inventory for slow moving product
Rebates can be used to hit new or find correct product price points
Rebates can be used to raise/reduce retail price in lieu of retailer price adjustments
Rebates are a cost effective price reduction (approximately 50% of purchases are never redeemed)