Its not clear to me that your examples of answers are either incorrect or off-topic.

In general, I don't see the problem with upvoting answers which don't quite answer the question as stated, but which nevertheless contribute to the general topic of a question and thus might help the reader, or might help other folks who can't quite answer the whole question by themselves.  

I'd of course hope that complete and valid answers would get yet more votes, but as David notes, sometimes the question itself is off-base.  E.g. you seem to be splitting hairs about how to define a "unique business model", especially one that is "unique to bitcoin".  What would that even mean (how specific is your definition of bitcoin), and why would it be important to make black-and-white distinctions between categories of business models?