I used to have the time for these, back in the day when Amazon would toss you a gift certificate of some sort just to "make up" for the "mistake". They don't do that anymore, in my experience. So now when you receive that single roll of tape, or four-pack, or whatever, they'll cover the return shipping, but you're stuck repacking the thing and sending it out, and it all becomes a pointless waste of time. Tempting if only because the tape keeps forever, but I already have about 10 rolls sitting here at the moment.
Wish everyone luck, but I'm not biting on this one.