There are legitimate reasons, such as health, transportation, work situation and child care. There are also reasons that a lot of juries are retirees.
A local judge tried to force a local business owner to shut his business down for an expected three week trial. He would have had nothing to come back to. He owns and runs a gas station by himself. I was called for the same trial. The medicine I was on had me going to the bathroom every 15 to 30 minutes.
They don't bother with voter polls, they use driver's license and property records to create the pools here.