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Elaborating on the thoughts of @PeterCooperJr.‭, it might be sensible to provide some meta statistics on each site on the main and / or "Ask Question" page.

For example, it might be viable to display the usual average response time to a given question. Maybe be even more detailed with how long it takes until it's answered by any person and how long it takes until it's answered by a domain expert. Another interesting statistics might be how many answers are to be expected. Some questions / topics don't have objective correct answers but a lot of correct subjective ones (think about cutting vegetables during cooking - many ways and nearly all of them are feasible in a way).

More statistics could be:

* Average online users
* Users online in the last 24 hours / 3 days / 7 days
* General ratio of questions asked and answers provided
* Number of domain experts
* Number of non-domain experts but high-rep users (if it's to be distinguished somehow)
* Time until the first interaction happens (casting votes, editing, answering etc.)
* Total number of questions (factually already exists on the top of each site)
* Total number of answers

All these numbers might encourage someone to ask a question here (numbers displaying a highly active community), however, they might also discourage someone to ask a question (numbers displaying an inactive community).