As a consumer, I like the idea of pre-screening for PDF products. There aren't always enough reviews or online opinions for PDF products, or any reviews at all, and unless you know the publisher, it's kind of a risk since all sales are final.
Edit: In terms of the poll, I like the Meet Minimal Standards option, but those minimal standards need to be clearly defined and available to potential publishers. And defining minimal standards - that's a whole 'nuther can of worms...