I have now added a voting statistic to the users list. It’s also visible in the /who command. It shows if a user was active on the server for a number of days and voted for the same number of days. The significant amount of people who did not vote at all despite being active on the server is showing that we need to do something to incentivize voting more than just the 100 Uncs & lottery.
Some people in chat already proposed a voting competition of sorts, but I am afraid that this will reward the top-voters to vote more, but not those who otherwise never vote. Any suggestion on getting people to vote more are welcome.
[Update] Something that I decided to do is create an achievement list like the one in-game where you get rewards for doing something for the first time. Like this we can incentivize new users to try out voting, shopping, depositing etc. and at the same time teach them about server features.[/update]