Can someone with > 15 karma up-vote a few of the decent questions? Karma needed to bootstrap participation.
It's not possible to vote for questions or answers without first having 15 karma. However since no question has been up-voted the vast majority of users are unable to participate in voting.
According to the user list there are only 6 people who can currently vote:
http://answers.gazebosim.org/users/
I know the gazebo devs are very busy. If the rest of us can vote we'll be able to help tend to answers.gazeboim.org and relieve the burden a bit.