I wonder if they are doing this, at least in part, because they really want a Chromebook that is high-end to display in their physical stores? Maybe having a really nice, really expensive Chromebook will make the brand not seem cheap to casual store browsers.
There's the famous framing story about the company that invented the bread maker. Everyone was interested in their product but hardly anyone bought it. They brought in a product specialist who told them to release a second, high-end version of the bread maker. Once they did this, the base model started flying off the shelves.