I will use CompUSA rebates if A)OF course I want the item and B) it's a minimum of $20 rebate. and C)It is at most one posting.

I've got nailed on C) when I had to mail off (2) envelopes one to manufact. and one to CompUSA for rebates to total to the advertized savings. I had asked about this in advance and been assured I didn't need to mail the actual UPC code off the box to both addresses, nevertheless the one I had sent the copy to, along with a note that the original UPC was going to the other rebate, refused to honor the coupon request.

I've also found that despite one's best efforts, distraction and life events can impede jumping through the hoops necessary to get off a rebate request. So I suppose when they price items they have statistical measures of how many more sales they will make versus how many rebates they can expect to honor. So the profit margin keeps marketing people employed and life goes on.