Why is Jury Duty Mandatory if it is a Civil Liberty?

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After receiving my jury duty summons, I read through the 4 page propaganda booklet looking for questions about the actual procedure of how to be in compliance with the summons. Instead, I found a huge Q&A about why I should be honored and privileged to be on a jury, and what happened if I din't accept this honor and privilege. Warrant, Jail and Fine were used liberally throughout. After actually showing up for my first of 7 appearances, I listened to the bailiff explain how they had to select from DMV users instead of registered voters as jury duty selection was causing people to avoid registering to vote. So my question is if they understand how reluctant people are to being a juror, why don't they increase the incentives? Jurors receive as much for pay in one day of service as many people make in an hour. With as much money circulating through our legal system, are we expected to believe $10-$15/day is the best they can muster? If they want people to get interested in jury duty, why don't they have the lawyers and judge each contribute an hour of their salary to compensating jurors? Juror Compensation rates - http://www.matrixbookstore.biz/trial_jury.htm