The Biggest Names in Books

This is a serious challenge with an odd rationale. It is taken from "Nabokov's Favorite Word Is Mauve". Below are all 26 authors with at least 3 bestsellers in 2005-2014, ranked by the size of their names on book covers. They are ranked by the typical percentage of the cover their name takes up. I have chosen 3 works of each author for this challenge (the specific works used in the 'study' are not detailed in the book).Median size of the author's name as % of the cover.
37%: Nora Roberts (aka J.D. Robb) - the BIG winner
34%: Harlan Coben
34%: J.D. Robb
32%: Mary Higgins Clark
28%: Patricia Cornwell
27%: Daniel Silva
26%: John Sandford
26%: Michael Connelly
24%: Janet Evanovich
22%: Vince Flynn
22%: Laurell Hamilton
22%: David Baldacci
17%: John Grisham
17%: J. R. Ward
17%: Lee Child
16%: Ken Follett
16%: Danielle Steel
16%: Stephen King
16%: Charlaine Harris
14%: Dean Koontz
13%: Jodi Picoult
12%: Sue Grafton
12%: James Patterson
9%: Jim Butcher
5%: Nicholas Sparks
3%: Mitch Albom