TSA not worth it.

FiveThirtyEight writes,

...the odds of being on given departure which is the subject of a terrorist incident have been 1 in 10,408,947 over the past decade. By contrast, the odds of being struck by lightning in a given year are about 1 in 500,000. This means that you could board 20 flights per year and still be less likely to be the subject of an attempted terrorist attack than to be struck by lightning.

Offsetting behaviour then adds,

Since the value of a statistical life, backed out of these kinds of calculations, is $7 million, our best guess is that folks would be unwilling to spend more than a dollar to insure against this risk. I get the feeling that the TSA's budget is considerably more than that.