Errors are increasing in pbooks as well. Publishers are simply cutting editorial expenses. I have discussed this several times (as well as what an editor's role is) in my
American Editor blog. I'm not sure what to advise. The problem is that the consumer doesn't find out how bad a book's quality is until
after they have purchased it. Then it's too late; very few consumers will return a pbook for any reason once purchased and policies prohibit ebook returns.
It seems to me that if poor quality can be demonstrated, an ebook should be returnable. But like most thinks in publishing the model is askew.