The unit is very expensive. I expect for many here, it's too expensive to buy once per year.

Personally I can afford it - but my purchase cycle is about every 3 years. Just don't see why I should keep spending over and over on hardware just to get software updates, when the hardware I already own is perfectly good for it technically, and is only not getting the software because the manufacturer's business model is not in my interests.

Put another way: Why would a consumer throw a lot of money every year at a single manufacturer, when seeing that devices from other manufacturers get several years of active support, receiving most of the latest software toys during that time, making it much cheaper to keep up with the shiny stuff - and you get better shiny stuff anyway?

Most of the value as time progresses is in the software, not new hardware features at this time.