Of the (generally) many things those specific types of consumers are ignorant about, their own ignorance is usually one of them.

Whereas I read "Unsatisfied! I did not read the listing!", they feel they wrote "Unsatisfied! Seller did not explain the item in the listing!" to the benefit of the other consumers in their same category. In a perverse way I could see it actually curbing those unwanted purchases in the future, but sadly at the expense of the seller.