There is no tendency to upvote questions on here yet I guess.
I don't have the full demographic data of users that uses Musing.io, but from what i see, they are mostly low sp users that tries to find an easy way to get upvotes on the Steem Blockchain (judging by the rampant plagiarism and low quality content we can all see on here).
Scarcity mindset? vote-weight hogging? lack of awareness that one can upvote questions? I am not these people so I wont know..
Personally I answer questions because I am abit of a smartass know-it-all wannabe myself. I did answer over 180+ questions on Quora in the last 3 months, so my incentives may not be the same as others.
But if i see a good question that makes a point (not stupid ones or ones that are obviously copied from Quora or worse, YahooAnswers) I'll upvote them...
Have my upvote kind sir!!