Almost every book I've bought has errors on nearly every page. Not the kind of typos you see in a published book, like bad grammer and misspelled words. What I'm seeing is formatting problems indicative of sloppy conversions that are not proofread. For example, paragraphs beginning in the middle of sentences, inappropriate hyphenation, terrible OCR conversions, etc. Probably 99% of the errors I see could have been caught and corrected by proofreading.