When you think about it, that's the great thing about movie tie-in editions; they can lead hordes of new readers to read classic books and authors they might have never discovered otherwise. And even if some of those readers are confused and/or disappointed because the book isn't exactly like the new movie, I like to think that most of them end up enjoying the book on its own terms . . . .
Speaking from personal experience, putting Will Smith on the cover of I AM LEGEND put Matheson's original novel on the bestseller list for the first time in over fifty years and got the book into the hands of literally hundreds of thousands
of new readers. That's a win-win for everybody.