Got a source for Stephen King's royalty rates being significantly above the standard rates for other authors? Everything I've found says royalties range from 10

Got a source for Stephen King's royalty rates being significantly above the standard rates for other authors? Everything I've found says royalties range from 10-15% for hardcover, like http://www.writersservices.com/res/ri_adv_royalties.htm http://www.writersservices.com/res/ri_adv_royalties.htm: "hardback royalties on the published price of trade books usually range from 10% to 12.5%, with 15% for more important authors" You talk about simple market economics, but the publishing industry seems to be a cartel, and authors are on the whole largely shafted. The music industry is the same way...