I think we should focus the main purpose of being here. I found WPChat via Google when I was searching something about WP. This is the first purpose; getting information about something else about WP. Focus on that.
When people want to get support about a topic related WP or want to read an answer about an issue, maybe they can pay to see/reveal it. Creating new topic can be a paid service. Because you can give them a value, give them a guarantee of getting the right answer to his question.
So, why am I still here? Because I believe the community, people should share their knowledge with other people. And WPChat can be the first place to gather people who are related about WP. If you can create a community on this topic, maybe after you can think about monetizing. Advertisements, paid posts, paid job lists, paid support, paid setting up someone's wp or any other things about WP can be monetized.