I don't know why they don't rate smart higher, since even in ngTLDs some highish value sales including word 'smart'. I would definitely rate smart higher, particularly combined with homes. So I was not meaning they were right. I just was pointing out that GD treat almost all ngTLD extensions the same - e.g. they say that robotic.gold and robotic.pizza are also worth $2048, even though neither of those make sense to me as domain names. Some users of GD GV use it to find a high figure, without realizing that the tool has (almost) no intelligence across the dot, which is the critical element for ngTLD value.
GoValue place huge importance on a previous high sale in a name in another extension. For example if stellar in some extension sold for a ridiculously high value, they would price it at that. As you say they have lots of Afternic data that we don't have access to through NameBio.
I agree entirely that their relative valuations here are puzzling.
Bob