Well it's an assumption that may work for you, but not for everybody : it really depends on what you're after.
Most of the models I create, I do not create for selling but for my own animation purposes, and once I have finished with them, I put them on selling places because I don't exactly know what to do with them.
My main motivation here is to create animations I could not create otherwise (sci-fi or medieval). Thus, I have very little to no interest in printable models or creating something that would work in the real world, as I expect to forget the real world when modeling, animating or rendering...
You can get some examples of my animation hobby here :
https://www.youtube.com/channel/UC7TfSsyntec3ZAgeRKZXeJg
So clearly a question of goal and focus depending on each individual.