[nhangen]

I've canceled several purchases for the same reason she did. Granted, if I need it, I buy it, but when it comes to discretionary purchases, the box has made a difference.

Maybe it's anecdotal, but add enough of them together and you have a legitimate case against the coupon box.

[z0r]

You can't sum anecdotes, addition is undefined for that kind of data

(But there might be a case there if you took some real measurements)

[nhangen]

You get the point. Sentiment matters.

[swombat]

The plural of anecdote is not data.