The problem is that there is no easy way for somebody to pay more to access this feature. You have to jump through hoops to buy it and you probably won't even get official support. Meanwhile the alternative to Windows doesn't cost anything monetarily. But at the end of the day, both of these aren't important factors yet. It's mostly a question of what OS the application you bought this CPU for runs on (or runs better on - Blender). The hardware is still expensive enough that people won't buy hardware like this "at random", but this is likely to change quickly.