Why single-out moderators? Sure, the site needs more questions, and if you have some good questions, then ask them. However, forcing users to ask questions when they don't have any just leads to poor, hypothetical questions that no one cares about the answers to.
I've been involved with the Pets beta site, which just came out of private beta not long ago. With everyone trying to fulfill their area51 committments, and lots of people trying to get their rep to climb, there have been some truly terrible questions asked. Many of them are hypothetical pet questions, asked by people that clearly don't actually own the animals they asked about and don't know anything about them.
Questions that are asked by people that actually have a question (rather than people just trying to fill up a site with questions) are much better.