This has been used many times before on other servers, but what about rewards for voting. Like you vote and receive via mail a decent Pot. Most places I've seen this at do the battle pots. ie, nothing NOT in game already.
Just restrict it to one vote reward a day and that'll stop ppl from hacking it to get more. You can even do a point system and let ppl "BUY" stuff with them. Like those pots. or maybe 5 points = 1 BOJ. Nothing too serious but a little thank you to the voters. Keep it small and you can change it later as you work it out and figure out how ppl are gonna hack it. Cause you know ppl with time will :-(