Why would people want an ad for something they bought already?
Maybe I didn't include enough context, but I'm sure what the advertiser was talking about was consumables, such as groceries and cleaning supplies.
I can easily believe coupons for those work, because without the coupon, the person might delay restocking, and consequently consuming, or might go to a different store to restock.
Obviously, the system isn't perfect. Sometimes the price you pay for sending someone a coupon that works is you have to send him 5 that don't. Amazon kept pressing me to buy a certain model of garbage can for a month after I bought it - from Amazon. But I know the program that did that works on average.
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