How do you compensate them? Based on the compensation of the attorneys, maybe, but which side - the low-paid public prosecutor or the high-powered defence attorney? If you raise compensation to a high level, then jury duty becomes attractive as a source of income for unemployed people, or as a target of scams and cons. If you simply restrict compensation to paying the jurors what they would have been paid in their usual jobs you have the problem of the temporarily unemployed but normally highly paid person. It's difficult, and the government has to strike a balance somewhere.

Remarkably, the most progressive state in terms of payment for jury duty is Arizona. On unusually long trials jurors are compensated up to several hundred dollars a day.