I worked at a store that heavily promoted these things to get foot traffic. The only people with problems were the people lining up on Sunday meaning to fill a cart with shit they didn’t need - or even know what it was to get it for “free”.
I remember one guy, who punched me in the mouth, screaming that he bought a scam video card “it doesn’t even play tapes” for $14.95 and didn’t get his $20 rebate for whatever reason. I think that he didn’t include the UPC code or something. The medical bills after I threw him out the window, the arrest and fine were a lot more than $14.95.
I used the free cd offers all of the time to get CD-Rs… we’d make custom mix CDs for the folks in our dorm.