Why do a question here at musing.io earn fewer reward compare to the answers?

I think Musing.io is all about rewarding users for giving beneficial answer to questions asked by members of the steem community.

Yes, I agree, without the questions, there would be no answers but if questions are asked and receive only one-liner answers, then it defeats the whole purpose of Musing.

As you know, most questions are one-liners and may not even take up to 30 seconds to create.

The same cannot be said for answers, as one trying to answer a question will need to think deeply and even research well enough so as to give a near perfect answer.

So I believe that's why questions do not get as much rewards as answers do.