Do I get this correctly: user earned fixed token for posting questions, and others also earned some token for answering the question? So who'll buy the token?
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As for Answerly's revenue - we earn by selling pro-membership packages. These packages range from $10-30 per month. These are optional but can be really helpful for further scaling your earnings and some additional perks that can be useful for promoting your business.
I highly recommend you to check out our whitepaper.
Hope this answers your query

And ads. I see that the pro packages include a "no ads" benefit, so there is a plan to populate the site with ads. It's not something wrong, though, just pointing out the obvious.
Like @mandor, I am also curious about spam filter. One thing that keeps crossing my mind is how you plan to prevent people from abusing the system by asking "what day is today?" or "what number comes after 1?" to reap the reward.