Blurbs can be very helpful to debut novels that lack naturally the reviews, as your book is not sold yet. The best blurbs come from an author writing within the same genre, since they will take advantage of a shared audience.
If you’re lucky enough to get a book into print with an important publisher, you may not be lucky enough to be “blurbed”, reviewed or read. If no one blurbs you, it just means you don’t know any writers more successful than you are. Don’t take it personally. Work on your networking… and add blurbs and reviews on your next reprints of the book and on your or your retailer’s websites. With an ebook it is much easier to add or change text, within minutes you can fit in your new blurbs.
Asking for blurbs needs sometimes a bit of friendly convincing. If your editor and / or publicist can do it for you, it gives you an advantage. If left on your own, ask writer friends or professors.
Have you ever offered someone else a blurb? Be kind to your fellow writers!