The curious question mark.

By now, everyone is aware that I read many books. I choose books written by Indie Authors and always do a review when I'm finished with the book.

Something has been bothering me lately..................
                                                                        ? ? ?

So many authors are using many, many question marks a the end of their dialogue sentences, and I'm not understanding why. There are times when the writer wants a declarative sentence to sound like a question; and I get that. But try as I might, I can't see the question in many of the sentences with question marks.

Can anyone come up with an explanation for me?