Yep. We sell them at our store.....they are meant to show the customer that they can get the garage in the photo for a set price....usually the kit garage has 2x4 walls, white siding and plain roofing....
More free than not, it brings the customer in, and then we 'upgrade' them to the siding they want, roof to match their house, and on and on.
There's no scam in the package whatsoever, but make sure you are comparing apples to apples when comparing packages (ie we always used pressure treated bottom plates and 2 x 6 walls, etc)