I haven't really noticed if any of my favorite authors have been affected by this. However, I have noticed that some of the cozy mystery series I read haven't had new books in awhile. This might be the reason.
I have it in my TBR. One book that always gets alot of attention is the Diana Gabadalon Outlander series. I tried reading it but couldn't get through the first book.
I'm definitely an impulse buyer and it's usually books. I can't remember what the last ones were, but if I go in for one specific book - I often come out with a bag with many more books than that.
If I have more than one copy of a book, it's because I didn't realize I already bought it. I've never bought re-issued ones, though, unless it's for a book I didn't get when the original was released.