[Spivak]

I'm less mad about those since it's basically just price discrimination. If you are price sensitive enough that you're willing to clip the coupon then you get the cheaper price.

[dchichkov]

At the expense of other people's time.

[wlesieutre]

And feature phones (aka dumbphones) have been seeing a sales uptick. I wouldn't say they're popular, but there are people without smartphones who are excluded from these types of coupons.