I agree with the others that I tend to pick up books with blurbs from authors I enjoy (at the moment - Diana Wynne Jones or Dave Langford would at least make me stop and check the book closely.)
On the other hand I enjoy blurbs that are provocative rather than glowing, and I admire those that add humor.
And sometimes I just pick up the book because the art work is great. For some reason I like snow scenes, I know I bought three copies of a Mike Moorcock novel with a snow scene, and I just bought a remainder Anne Perry with a snow scene on the cover. Though that could be because it's summer.
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On the other hand I enjoy blurbs that are provocative rather than glowing, and I admire those that add humor.
And sometimes I just pick up the book because the art work is great. For some reason I like snow scenes, I know I bought three copies of a Mike Moorcock novel with a snow scene, and I just bought a remainder Anne Perry with a snow scene on the cover. Though that could be because it's summer.