I worked retail for quite a few years in the 80's and 90's. The rebate is an incentive to sell product quickly, often because they are overstocked on an item, a newer version is coming out, etc.....The theory behind the rebate is only about 50% of the people that actually buy the product send in the rebate form for the reimbursement. Of that, only about 75% actually cash the check or use the pre-paid debit card.
You would be amazed at the amount of gift cards that go unused and/or expire....
So the theory is if you have an item for $60, and you have a $60 rebate, about 50% of the people send in the rebate. That makes an effective rebate of $30. Now, only 75% cash it or use it, so the $30 becomes $22.50.