Or are intentionally selected against by defense attorneys. I've spent several days on several different instances sitting as a member of a jury pool. My probably cynical, but also probably pretty accurate impression is that prosecutors want just the juror you describe, defense attorneys want just the opposite.
I also wonder about how jurors get onto the summons list. The last time I was there everyone I spoke to had been called multiple times. There were no first timers that I encountered. I've received 5 summons for various courts in the last 10 years - got excused from 3 appearances and spent time sitting as a part of the pool in 2.
I wouldn't mind sitting in the jury pool for several days (losing income for those days) if there was a chance in hell that I'd be selected. But it turns out to be a waste of time and money for me. /end of my rant with a slightly different perspective than yours:)
Well, at least you've tried. Good citizen award to NotPA. :-)