The '30 Americans' estimate would be correct if they all had an equal (1 in 3,000) chance. But the odds aren't equally distributed. Certainly in the UK, your annual chance of being struck by lightning must be a lot less than 1 in 700,000 - otherwise it would happen to nearly 100 people every year, whereas only 3 people annually are killed by lightning in the UK. I expect the disparity between states is equally great.