An old saying states that "The Devil is in the particulars." An alternative expression is "God can be found in small details." One self-published book may be so riddled with fiendish grammatical errors that a reader throws it down in disgust. Yet another self-published book will be a pleasure to read, resulting in a transcendent mind-to-mind communication between author and reader.
Sometimes the differences depend on quality editing. Once the details are taken care of, the entire book snaps into shape. If you self-publish your book, it requires professional editing since you don't be able to access the copy editor of the publisher or a proofreader. Even the most experienced authors must undergo the editing process before they contract with a publishing house. You can also get help from a publishing company via selfpublishingmadeeasynow.com to self publish book online.
Image Source: Google
Too much is at stake, financially, for the publisher to send a flawed book out into the market. As a self-publishing author, you face the same economic risks. If your written words don't connect with readers, the book won't sell, and the money you invested in printing will simply become a tax write-off.
You could decide to self-publish due to a variety of reasons. Maybe you've written a novel that is targeted towards a particular market, instead of aiming at the mass market. Perhaps you've tried to locate an agent or a publisher but were turned down enough times to look at different options.
You might also be motivated by success stories of self-publishing of authors who were later accepted and their books were best-selling. It is essential to do your research thoroughly on the company that you select for self-publishing and also to get a lawyer to review the contract. Certain companies are casual and do not ask their customers to do anything other than to pay for printing.