This is definitely true and something the Musing team is working on. As our curation team continues to improve and expand, questions will receive more upvotes and incentivization. It's hard to get to every post on Musing.

The other reason is that questions naturally have a bit of incentivization in comparison to answers. A question-asker can receive a reward just by having her question answered.

Again, we will improve this process over time :)