Sometimes a seller will miss the correct category by accident. It has almost happened to me a couple of times. It's easy to slide right past the category when you are adding a new item, and the SW just defaults to the last category used. A wrong category might get your attention, but I doubt that it increases sales - that would imply that people looking for coins are impulse buyers, which is certainly not the case for all the collectors I know.
Cheers!
Steve