CourseHero provides minimal preview access so the buyer is not totally aware of the potential helpfulness of the documents. They will not return your money if you have accessed any documents whatsoever, so how are you supposed to know if anything is even helpful or useful to your coursework? This is a predatory model that feeds on students trying to do better in coursework. They get quick cash from students who subscribe once, access one or two documents, and never come back. Absolutely disgusting.