I've changed the title of this thread from "Comic Book Sales Trends in 2016" because I keep coming back to it.
My friendly neighborhood comics shop, Fantom Comics of Washington, DC, breaks down what sold at the store in 2016. This information, of course, applies only to the one store, but it's still interesting reading: "2016 In Review – A Comic Book Shop Talks Comic Book Sales Trends"
Marvel's president, Jim Galton, initially passed on the deal? Because DC's books weren't selling, so “those characters must not be any good”?
A visit to Comichron.com tells me that DC's best selling book for July was DCeased #3; a non continuity elseworlds tale At 132,072 copies, It was outsold only by Hickman's X-Men books in July.
DC's big blockbuster book, Event Leviathan # 2 was much further down the list and sold only 53,334 copies. Go figure!