They are legit takedowns of a takedown. They are legit, it's just that nobody cares enough about them to take pics, write reviews, or announce that they copped them.
For example, have you ever heard of the Nike Backboard high?
I have this exact pair. My girl bought em for me while she was traveling. The shape is better in real life and the colors work a lot better, and they are actually very comfortable. There are lots of models out there people never have heard of. If you are at a footlocker, champs, Footaction, etc chances are they are selling real shoes just not popular ones. They make these for people who want the swoosh but don't want to pay more than 69.99 or whatever they are priced.