1.) The book is a piece of poop which is why they didn't get an agent in the first place
First of all, you don't know if a piece of writing is "poop" unless you actually read it. And just because they couldn't get an agent doesn't mean their work isn't any good. Agents are very selective and mostly only take on work that they think will sell. But the manuscripts agents pass on-could be the next bestseller. You should read Amanda Hocking's blog-who self published many novels and now because of the books she has sold through amazon and other online booksellers, she has an agent and has just received a seven figure deal with a publisher.
2.) The price is low, which means the book isn't good
I know many people don't think this, but I used to. A few months ago I would search through amazon looking for more werwolf books. I found a lot, but some of them were only 99 cents. I was a little iffy, because why would they price the book so low? They do it for the readers! If they can make the price of the book low and still make profit, why wouldn't they?
3.) Don't buy it because there's no editing
I'm not trying to put anyone down or categorize people in any way. I'm just stating what comes along with self publishing. And I feel it's wrong. But I shouldn't be talking because I was the same way-I never even looked the way of indie/self published books. But ever since I've read Lunarmorte by Samantha Young, My Blood Approves by Amanda Hocking, and Verity by Claire Farrell-I have been looking for more and more self published books that I'll be able to cherish. I also see under many book bloggers "review policy" posts that they don't accept self published novels to review. I know some bloggers state that because they have enough books coming in the mail already. But I'm sure a few bloggers fall to the stereotypes that come along with self publishing. I just ask that the next time you upgrade your "review policy" that you think twice before you eliminate a whole group of authors just based on how they publish their novels.