Supposedly, for what amounts to an "extremely important civic duty", pays to what amounts illegal under-minimum wage for compelled work. Its usually $60/day which is barely $7.50/hr. Then you have to pay for parking and overly expensive food downtown.
And the only reason people even care about being on a jury is because we are threatened with state violence if we dont. Its not like they have to pay people fairly - they just threaten you with contempt of court and jail.
Money wouldn't solve everything, sure. But being paid $50/hr would greatly alleviate many problems.