Feeds is not importing images into subfolders
My solution to a similar problem was installing FileField module and in the content type design, put the attached files (as images in the example) in a structured folder by tokens.

This way, when feeds grab the image and attach to node, file_fields module gets the task and put the image into a folder as you mention by design.

It's also helpful when you add single content, not bulk import operations.Everything organized just as you plan.